Cycles in family tree software

Instead of removing all assertions, you should still check for things like a person being his/her own parent or other impossible situations and present an error. Maybe issue a warning if it is unlikely so the user can still detect common input errors, but it will work if everything is correct.

I would store the data in a vector with a permanent integer for each person and store the parents and children in person objects where the said int is the index of the vector. This would be pretty fast to go between generations (but slow for things like name searches). The objects would be in order of when they were created.

execute shell command from android

A modification of the code by @CarloCannas:

public static void sudo(String...strings) {
    try{
        Process su = Runtime.getRuntime().exec("su");
        DataOutputStream outputStream = new DataOutputStream(su.getOutputStream());

        for (String s : strings) {
            outputStream.writeBytes(s+"\n");
            outputStream.flush();
        }

        outputStream.writeBytes("exit\n");
        outputStream.flush();
        try {
            su.waitFor();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        outputStream.close();
    }catch(IOException e){
        e.printStackTrace();
    }
}

(You are welcome to find a better place for outputStream.close())

Usage example:

private static void suMkdirs(String path) {
    if (!new File(path).isDirectory()) {
        sudo("mkdir -p "+path);
    }
}

Update: To get the result (the output to stdout), use:

public static String sudoForResult(String...strings) {
    String res = "";
    DataOutputStream outputStream = null;
    InputStream response = null;
    try{
        Process su = Runtime.getRuntime().exec("su");
        outputStream = new DataOutputStream(su.getOutputStream());
        response = su.getInputStream();

        for (String s : strings) {
            outputStream.writeBytes(s+"\n");
            outputStream.flush();
        }

        outputStream.writeBytes("exit\n");
        outputStream.flush();
        try {
            su.waitFor();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        res = readFully(response);
    } catch (IOException e){
        e.printStackTrace();
    } finally {
        Closer.closeSilently(outputStream, response);
    }
    return res;
}
public static String readFully(InputStream is) throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    int length = 0;
    while ((length = is.read(buffer)) != -1) {
        baos.write(buffer, 0, length);
    }
    return baos.toString("UTF-8");
}

The utility to silently close a number of Closeables (So?ket may be no Closeable) is:

public class Closer {
// closeAll()
public static void closeSilently(Object... xs) {
    // Note: on Android API levels prior to 19 Socket does not implement Closeable
    for (Object x : xs) {
        if (x != null) {
            try {
                Log.d("closing: "+x);
                if (x instanceof Closeable) {
                    ((Closeable)x).close();
                } else if (x instanceof Socket) {
                    ((Socket)x).close();
                } else if (x instanceof DatagramSocket) {
                    ((DatagramSocket)x).close();
                } else {
                    Log.d("cannot close: "+x);
                    throw new RuntimeException("cannot close "+x);
                }
            } catch (Throwable e) {
                Log.x(e);
            }
        }
    }
}
}

Dynamically Dimensioning A VBA Array?

You need to use a constant.

CONST NumberOfZombies = 20000
Dim Zombies(NumberOfZombies) As Zombies

or if you want to use a variable you have to do it this way:

Dim NumberOfZombies As Integer
NumberOfZombies = 20000

Dim Zombies() As Zombies

ReDim Zombies(NumberOfZombies)

VB.NET - How to move to next item a For Each Loop?

I want to be clear that the following code is not good practice. You can use GOTO Label:

For Each I As Item In Items

    If I = x Then
       'Move to next item
        GOTO Label1
    End If

    ' Do something
    Label1:
Next

How to convert Json array to list of objects in c#

Your data structure and your JSON do not match.

Your JSON is this:

{
    "JsonValues":{
        "id": "MyID",
        ...
    }
}

But the data structure you try to serialize it to is this:

class ValueSet
{
    [JsonProperty("id")]
    public string id
    {
        get;
        set;
    }
    ...
}

You are skipping a step: Your JSON is a class that has one property named JsonValues, which has an object of your ValueSet data structure as value.

Also inside your class your JSON is this:

"values": { ... }

Your data structure is this:

[JsonProperty("values")]
public List<Value> values
{
    get;
    set;
}

Note that { .. } in JSON defines an object, where as [ .. ] defines an array. So according to your JSON you don't have a bunch of values, but you have one values object with the properties value1 and value2 of type Value.

Since the deserializer expects an array but gets an object instead, it does the least non-destructive (Exception) thing it could do: skip the value. Your property values remains with it's default value: null.

If you can: Adjust your JSON. The following would match your data structure and is most likely what you actually want:

{
    "id": "MyID",

     "values": [
         {
            "id": "100",
            "diaplayName": "MyValue1"
         }, {
            "id": "200",
            "diaplayName": "MyValue2"
         }
     ]
}

Mongoose: CastError: Cast to ObjectId failed for value "[object Object]" at path "_id"

I am not sure this will help but I resolved the issue by importing mongoose like below and implementing it as below

const mongoose = require('mongoose')

_id: new mongoose.Types.ObjectId(),

Creating the checkbox dynamically using JavaScript?

You're trying to put a text node inside an input element.

Input elements are empty and can't have children.

...
var checkbox = document.createElement('input');
checkbox.type = "checkbox";
checkbox.name = "name";
checkbox.value = "value";
checkbox.id = "id";

var label = document.createElement('label')
label.htmlFor = "id";
label.appendChild(document.createTextNode('text for label after checkbox'));

container.appendChild(checkbox);
container.appendChild(label);

How to implement Rate It feature in Android App

I think what you are trying to do is probably counter-productive.

Making it easy for people to rate apps is generally a good idea, as most people who bother do so because they like the app. It is rumoured that the number of ratings affects your market rating (although I see little evidence of this). Hassling users into rating - through nag screens - is likely to cause people to clear the nag through leaving a bad rating.

Adding the capability to directly rate an app has caused a slight decrease in the numerical ratings for my free version, and a slight increase in my paid app. For the free app, my 4 star ratings increased more than my 5 star ratings, as people who thought my app was good but not great started to rate it as well. Change was about -0.2. For the paid, change was about +0.1. I should remove it from the free version, except I like getting lots of comments.

I put my rating button into a settings (preference) screen, where it does not affect normal operation. It still increased my rating rate by a factor of 4 or 5. I have no doubt that if I tried nagging my users into making a rating, I would get lots of users giving me bad ratings as a protest.

Javascript - Replace html using innerHTML

You should chain the replace() together instead of assigning the result and replacing again.

var strMessage1 = document.getElementById("element1") ;
strMessage1.innerHTML = strMessage1.innerHTML
                        .replace(/aaaaaa./g,'<a href=\"http://www.google.com/')
                        .replace(/.bbbbbb/g,'/world\">Helloworld</a>');

See DEMO.

Find full path of the Python interpreter?

There are a few alternate ways to figure out the currently used python in Linux is:

which python command.
command -v python command
type python command

Similarly On Windows with Cygwin will also result the same.

kuvivek@HOSTNAME ~
$ which python
/usr/bin/python

kuvivek@HOSTNAME ~
$ whereis python
python: /usr/bin/python /usr/bin/python3.4 /usr/lib/python2.7 /usr/lib/python3.4        /usr/include/python2.7 /usr/include/python3.4m /usr/share/man/man1/python.1.gz

kuvivek@HOSTNAME ~
$ which python3
/usr/bin/python3

kuvivek@HOSTNAME ~
$ command -v python
/usr/bin/python

kuvivek@HOSTNAME ~
$ type python
python is hashed (/usr/bin/python)

If you are already in the python shell. Try anyone of these. Note: This is an alternate way. Not the best pythonic way.

>>> import os
>>> os.popen('which python').read()
'/usr/bin/python\n'
>>>
>>> os.popen('type python').read()
'python is /usr/bin/python\n'
>>>
>>> os.popen('command -v python').read()
'/usr/bin/python\n'
>>>
>>>

If you are not sure of the actual path of the python command and is available in your system, Use the following command.

pi@osboxes:~ $ which python
/usr/bin/python
pi@osboxes:~ $ readlink -f $(which python)
/usr/bin/python2.7
pi@osboxes:~ $ 
pi@osboxes:~ $ which python3
/usr/bin/python3
pi@osboxes:~ $ 
pi@osboxes:~ $ readlink -f $(which python3)
/usr/bin/python3.7
pi@osboxes:~ $

Full path from file input using jQuery

Well, getting full path is not possible but we can have a temporary path.

Try This:

It'll give you a temporary path not the accurate path, you can use this script if you want to show selected images as in this jsfiddle example(Try it by selectng images as well as other files):-

JSFIDDLE

Here is the code :-

HTML:-

<input type="file" id="i_file" value=""> 
<input type="button" id="i_submit" value="Submit">
    <br>
<img src="" width="200" style="display:none;" />
        <br>
<div id="disp_tmp_path"></div>

JS:-

$('#i_file').change( function(event) {
var tmppath = URL.createObjectURL(event.target.files[0]);
    $("img").fadeIn("fast").attr('src',URL.createObjectURL(event.target.files[0]));

    $("#disp_tmp_path").html("Temporary Path(Copy it and try pasting it in browser address bar) --> <strong>["+tmppath+"]</strong>");
});

Its not exactly what you were looking for, but may be it can help you somewhere.

ssh: The authenticity of host 'hostname' can't be established

Depending on your ssh client, you can set the StrictHostKeyChecking option to no on the command line, and/or send the key to a null known_hosts file. You can also set these options in your config file, either for all hosts or for a given set of IP addresses or host names.

ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no

EDIT

As @IanDunn notes, there are security risks to doing this. If the resource you're connecting to has been spoofed by an attacker, they could potentially replay the destination server's challenge back to you, fooling you into thinking that you're connecting to the remote resource while in fact they are connecting to that resource with your credentials. You should carefully consider whether that's an appropriate risk to take on before altering your connection mechanism to skip HostKeyChecking.

Reference.

How to list branches that contain a given commit?

From the git-branch manual page:

 git branch --contains <commit>

Only list branches which contain the specified commit (HEAD if not specified). Implies --list.

 git branch -r --contains <commit>

Lists remote tracking branches as well (as mentioned in user3941992's answer below) that is "local branches that have a direct relationship to a remote branch".

As noted by Carl Walsh, this applies only to the default refspec

fetch = +refs/heads/*:refs/remotes/origin/*

If you need to include other ref namespace (pull request, Gerrit, ...), you need to add that new refspec, and fetch again:

git config --add remote.origin.fetch "+refs/pull/*/head:refs/remotes/origin/pr/*"
git fetch
git branch -r --contains <commit>

What does '?' do in C++?

This is a ternary operator, it's basically an inline if statement

x ? y : z

works like

if(x) y else z

except, instead of statements you have expressions; so you can use it in the middle of a more complex statement.

It's useful for writing succinct code, but can be overused to create hard to maintain code.

Two's Complement in Python

You can use the bit_length() function to convert numbers to their two's complement:

def twos_complement(j):
   return j-(1<<(j.bit_length()))

In [1]: twos_complement(0b111111111111)                                                                                                                                                             
Out[1]: -1

INSERT INTO a temp table, and have an IDENTITY field created, without first declaring the temp table?

Oh ye of little faith:

SELECT *, IDENTITY( int ) AS idcol
  INTO #newtable
  FROM oldtable

http://msdn.microsoft.com/en-us/library/aa933208(SQL.80).aspx

C# Threading - How to start and stop a thread

Thread th = new Thread(function1);
th.Start();
th.Abort();

void function1(){
//code here
}

Starting ssh-agent on Windows 10 fails: "unable to start ssh-agent service, error :1058"

I get the same error in Cygwin. I had to install the openssh package in Cygwin Setup.

(The strange thing was that all ssh-* commands were valid, (bash could execute as program) but the openssh package wasn't installed.)

Python Prime number checker

a=input("Enter number:")

def isprime(): 

    total=0
    factors=(1,a)# The only factors of a number
    pfactors=range(1,a+1) #considering all possible factors


    if a==1 or a==0:# One and Zero are not prime numbers
        print "%d is NOT prime"%a


    elif a==2: # Two is the only even prime number
        print "%d is  prime"%a


    elif a%2==0:#Any even number is not prime except two
        print "%d is NOT prime"%a  



    else:#a number is prime if its multiples are 1 and itself 
         #The sum of the number that return zero moduli should be equal to the "only" factors
        for number in pfactors: 
            if (a%number)==0: 
                total+=number
        if total!=sum(factors):
            print "%d is NOT prime"%a 
        else:
             print "%d is  prime"%a
isprime()

Generate a random point within a circle (uniformly)

I used once this method: This may be totally unoptimized (ie it uses an array of point so its unusable for big circles) but gives random distribution enough. You could skip the creation of the matrix and draw directly if you wish to. The method is to randomize all points in a rectangle that fall inside the circle.

bool[,] getMatrix(System.Drawing.Rectangle r) {
    bool[,] matrix = new bool[r.Width, r.Height];
    return matrix;
}

void fillMatrix(ref bool[,] matrix, Vector center) {
    double radius = center.X;
    Random r = new Random();
    for (int y = 0; y < matrix.GetLength(0); y++) {
        for (int x = 0; x < matrix.GetLength(1); x++)
        {
            double distance = (center - new Vector(x, y)).Length;
            if (distance < radius) {
                matrix[x, y] = r.NextDouble() > 0.5;
            }
        }
    }

}

private void drawMatrix(Vector centerPoint, double radius, bool[,] matrix) {
    var g = this.CreateGraphics();

    Bitmap pixel = new Bitmap(1,1);
    pixel.SetPixel(0, 0, Color.Black);

    for (int y = 0; y < matrix.GetLength(0); y++)
    {
        for (int x = 0; x < matrix.GetLength(1); x++)
        {
            if (matrix[x, y]) {
                g.DrawImage(pixel, new PointF((float)(centerPoint.X - radius + x), (float)(centerPoint.Y - radius + y)));
            }
        }
    }

    g.Dispose();
}

private void button1_Click(object sender, EventArgs e)
{
    System.Drawing.Rectangle r = new System.Drawing.Rectangle(100,100,200,200);
    double radius = r.Width / 2;
    Vector center = new Vector(r.Left + radius, r.Top + radius);
    Vector normalizedCenter = new Vector(radius, radius);
    bool[,] matrix = getMatrix(r);
    fillMatrix(ref matrix, normalizedCenter);
    drawMatrix(center, radius, matrix);
}

enter image description here

Base64: java.lang.IllegalArgumentException: Illegal character

Your encoded text is [B@6499375d. That is not Base64, something went wrong while encoding. That decoding code looks good.

Use this code to convert the byte[] to a String before adding it to the URL:

String encodedEmailString = new String(encodedEmail, "UTF-8");
// ...
String confirmLink = "Complete your registration by clicking on following"
    + "\n<a href='" + confirmationURL + encodedEmailString + "'>link</a>";

How do I format a String in an email so Outlook will print the line breaks?

Adding "\t\r\n" ( \t for TAB) instead of "\r\n" worked for me on Outlook 2010 . Note : adding 3 spaces at end of each line also do same thing but that looks like a programming hack!

What are the differences between the urllib, urllib2, urllib3 and requests module?

urllib2 provides some extra functionality, namely the urlopen() function can allow you to specify headers (normally you'd have had to use httplib in the past, which is far more verbose.) More importantly though, urllib2 provides the Request class, which allows for a more declarative approach to doing a request:

r = Request(url='http://www.mysite.com')
r.add_header('User-Agent', 'awesome fetcher')
r.add_data(urllib.urlencode({'foo': 'bar'})
response = urlopen(r)

Note that urlencode() is only in urllib, not urllib2.

There are also handlers for implementing more advanced URL support in urllib2. The short answer is, unless you're working with legacy code, you probably want to use the URL opener from urllib2, but you still need to import into urllib for some of the utility functions.

Bonus answer With Google App Engine, you can use any of httplib, urllib or urllib2, but all of them are just wrappers for Google's URL Fetch API. That is, you are still subject to the same limitations such as ports, protocols, and the length of the response allowed. You can use the core of the libraries as you would expect for retrieving HTTP URLs, though.

Display PNG image as response to jQuery AJAX request

Method 1

You should not make an ajax call, just put the src of the img element as the url of the image.

This would be useful if you use GET instead of POST

<script type="text/javascript" > 

  $(document).ready( function() { 
      $('.div_imagetranscrits').html('<img src="get_image_probes_via_ajax.pl?id_project=xxx" />')
  } );

</script>

Method 2

If you want to POST to that image and do it the way you do (trying to parse the contents of the image on the client side, you could try something like this: http://en.wikipedia.org/wiki/Data_URI_scheme

You'll need to encode the data to base64, then you could put data:[<MIME-type>][;charset=<encoding>][;base64],<data> into the img src

as example:

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" alt="Red dot img" />

To encode to base64:

in plain javascript, see How can you encode a string to Base64 in JavaScript?
in perl http://perldoc.perl.org/MIME/Base64.html
in php http://php.net/manual/en/function.base64-encode.php

What is the meaning of @_ in Perl?

Never try to edit to @_ variable!!!! They must be not touched.. Or you get some unsuspected effect. For example...

my $size=1234;
sub sub1{
  $_[0]=500;
}
sub1 $size;

Before call sub1 $size contain 1234. But after 500(!!) So you Don't edit this value!!! You may pass two or more values and change them in subroutine and all of them will be changed! I've never seen this effect described. Programs I've seen also leave @_ array readonly. And only that you may safely pass variable don't changed internal subroutine You must always do that:

sub sub2{
  my @m=@_;
  ....
}

assign @_ to local subroutine procedure variables and next worked with them. Also in some deep recursive algorithms that returun array you may use this approach to reduce memory used for local vars. Only if return @_ array the same.

How to create a HTTP server in Android?

NanoHttpd works like a charm on Android -- we have code in production, in users hands, that's built on it.

The license absolutely allows commercial use of NanoHttpd, without any "viral" implications.

Postgres: check if array field contains value?

This should work:

select * from mytable where 'Journal'=ANY(pub_types);

i.e. the syntax is <value> = ANY ( <array> ). Also notice that string literals in postresql are written with single quotes.

Name attribute in @Entity and @Table

@Entity is useful with model classes to denote that this is the entity or table

@Table is used to provide any specific name to your table if you want to provide any different name

Note: if you don't use @Table then hibernate consider that @Entity is your table name by default and @Entity must

@Entity    
@Table(name = "emp")     
public class Employee implements java.io.Serializable    
{

}

How to catch exception correctly from http.request()?

New service updated to use the HttpClientModule and RxJS v5.5.x:

import { Injectable }                    from '@angular/core';
import { HttpClient, HttpErrorResponse } from '@angular/common/http';
import { Observable }                    from 'rxjs/Observable';
import { catchError, tap }               from 'rxjs/operators';
import { SomeClassOrInterface}           from './interfaces';
import 'rxjs/add/observable/throw';

@Injectable() 
export class MyService {
    url = 'http://my_url';
    constructor(private _http:HttpClient) {}
    private handleError(operation: String) {
        return (err: any) => {
            let errMsg = `error in ${operation}() retrieving ${this.url}`;
            console.log(`${errMsg}:`, err)
            if(err instanceof HttpErrorResponse) {
                // you could extract more info about the error if you want, e.g.:
                console.log(`status: ${err.status}, ${err.statusText}`);
                // errMsg = ...
            }
            return Observable.throw(errMsg);
        }
    }
    // public API
    public getData() : Observable<SomeClassOrInterface> {
        // HttpClient.get() returns the body of the response as an untyped JSON object.
        // We specify the type as SomeClassOrInterfaceto get a typed result.
        return this._http.get<SomeClassOrInterface>(this.url)
            .pipe(
                tap(data => console.log('server data:', data)), 
                catchError(this.handleError('getData'))
            );
    }

Old service, which uses the deprecated HttpModule:

import {Injectable}              from 'angular2/core';
import {Http, Response, Request} from 'angular2/http';
import {Observable}              from 'rxjs/Observable';
import 'rxjs/add/observable/throw';
//import 'rxjs/Rx';  // use this line if you want to be lazy, otherwise:
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/do';  // debug
import 'rxjs/add/operator/catch';

@Injectable()
export class MyService {
    constructor(private _http:Http) {}
    private _serverError(err: any) {
        console.log('sever error:', err);  // debug
        if(err instanceof Response) {
          return Observable.throw(err.json().error || 'backend server error');
          // if you're using lite-server, use the following line
          // instead of the line above:
          //return Observable.throw(err.text() || 'backend server error');
        }
        return Observable.throw(err || 'backend server error');
    }
    private _request = new Request({
        method: "GET",
        // change url to "./data/data.junk" to generate an error
        url: "./data/data.json"
    });
    // public API
    public getData() {
        return this._http.request(this._request)
          // modify file data.json to contain invalid JSON to have .json() raise an error
          .map(res => res.json())  // could raise an error if invalid JSON
          .do(data => console.log('server data:', data))  // debug
          .catch(this._serverError);
    }
}

I use .do() (now .tap()) for debugging.

When there is a server error, the body of the Response object I get from the server I'm using (lite-server) contains just text, hence the reason I use err.text() above rather than err.json().error. You may need to adjust that line for your server.

If res.json() raises an error because it could not parse the JSON data, _serverError will not get a Response object, hence the reason for the instanceof check.

In this plunker, change url to ./data/data.junk to generate an error.

Users of either service should have code that can handle the error:

@Component({
    selector: 'my-app',
    template: '<div>{{data}}</div> 
       <div>{{errorMsg}}</div>`
})
export class AppComponent {
    errorMsg: string;
    constructor(private _myService: MyService ) {}
    ngOnInit() {
        this._myService.getData()
            .subscribe(
                data => this.data = data,
                err  => this.errorMsg = <any>err
            );
    }
}

How to run a script as root on Mac OS X?

Or you can access root terminal by typing sudo -s

How long would it take a non-programmer to learn C#, the .NET Framework, and SQL?

When I switched careers out of Finance, I took 9 months off to study C++ full-time out of a book by Ivor Horton. I had a lot of support from my best friend, who is a guru, and I had been programming as a hobby since high school (I was 36 at the time).

It's not just the syntax that's an issue. The idea of things like pointers, passing by reference, multi-tiered architectures, struct's vs classes, etc., these all take time to understand and learn to use. And you're adding to that the .Net framework, which is huge and constantly evolving, and SQL, which is a totally different skill set than C#. You also haven't mentioned various subsets of the framework that are becoming more widely used, like WPF, WCF, WF, etc.

You're an academic so you can definitely do it, but it's going to take serious effort for a long time, and you definitely will need some projects to work on and learn from. Good luck to you.

How to hide a button programmatically?

Kotlin code is a lot simpler:

if(isVisable) {
    clearButton.visibility = View.INVISIBLE
}
else {
    clearButton.visibility = View.VISIBLE
}

How to change the current URL in javascript?

Even it is not a good way of doing what you want try this hint: var url = MUST BE A NUMER FIRST

function nextImage (){
url = url + 1;  
location.href='http://mywebsite.com/' + url+'.html';
}

Where does flask look for image files?

It took me a while to figure this out too. url_for in Flask looks for endpoints that you specified in the routes.py script.

So if you have a decorator in your routes.py file like @blah.route('/folder.subfolder') then Flask will recognize the command {{ url_for('folder.subfolder') , filename = "some_image.jpg" }} . The 'folder.subfolder' argument sends it to a Flask endpoint it recognizes.

However let us say that you stored your image file, some_image.jpg, in your subfolder, BUT did not specify this subfolder as a route endpoint in your flask routes.py, your route decorator looks like @blah.routes('/folder'). You then have to ask for your image file this way: {{ url_for('folder'), filename = 'subfolder/some_image.jpg' }}

I.E. you tell Flask to go to the endpoint it knows, "folder", then direct it from there by putting the subdirectory path in the filename argument.

Python `if x is not None` or `if not x is None`?

There's no performance difference, as they compile to the same bytecode:

>>> import dis
>>> dis.dis("not x is None")
  1           0 LOAD_NAME                0 (x)
              2 LOAD_CONST               0 (None)
              4 COMPARE_OP               9 (is not)
              6 RETURN_VALUE
>>> dis.dis("x is not None")
  1           0 LOAD_NAME                0 (x)
              2 LOAD_CONST               0 (None)
              4 COMPARE_OP               9 (is not)
              6 RETURN_VALUE

Stylistically, I try to avoid not x is y, a human reader might misunderstand it as (not x) is y. If I write x is not y then there is no ambiguity.

The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32'

I had the same error, but for me, the issue was that I was doing the request with a wrong GUID. I missed the last 2 characters.

360476f3-a4c8-4e1c-96d7-3c451c6c86
360476f3-a4c8-4e1c-96d7-3c451c6c865e

Bind service to activity in Android

There is a method called unbindService that will take a ServiceConnection which you will have created upon calling bindService. This will allow you to disconnect from the service while still leaving it running.

This may pose a problem when you connect to it again, since you probably don't know whether it's running or not when you start the activity again, so you'll have to consider that in your activity code.

Good luck!

How to fix Ora-01427 single-row subquery returns more than one row in select?

Use the following query:

SELECT E.I_EmpID AS EMPID,
       E.I_EMPCODE AS EMPCODE,
       E.I_EmpName AS EMPNAME,
       REPLACE(TO_CHAR(A.I_REQDATE, 'DD-Mon-YYYY'), ' ', '') AS FROMDATE,
       REPLACE(TO_CHAR(A.I_ENDDATE, 'DD-Mon-YYYY'), ' ', '') AS TODATE,
       TO_CHAR(NOD) AS NOD,
       DECODE(A.I_DURATION,
              'FD',
              'FullDay',
              'FN',
              'ForeNoon',
              'AN',
              'AfterNoon') AS DURATION,
       L.I_LeaveType AS LEAVETYPE,
       REPLACE(TO_CHAR((SELECT max(C.I_WORKDATE)
                         FROM T_COMPENSATION C
                        WHERE C.I_COMPENSATEDDATE = A.I_REQDATE
                          AND C.I_EMPID = A.I_EMPID),
                       'DD-Mon-YYYY'),
               ' ',
               '') AS WORKDATE,
       A.I_REASON AS REASON,
       AP.I_REJECTREASON AS REJECTREASON
  FROM T_LEAVEAPPLY A
 INNER JOIN T_EMPLOYEE_MS E
    ON A.I_EMPID = E.I_EmpID
   AND UPPER(E.I_IsActive) = 'YES'
   AND A.I_STATUS = '1'
 INNER JOIN T_LeaveType_MS L
    ON A.I_LEAVETYPEID = L.I_LEAVETYPEID
  LEFT OUTER JOIN T_APPROVAL AP
    ON A.I_REQDATE = AP.I_REQDATE
   AND A.I_EMPID = AP.I_EMPID
   AND AP.I_APPROVALSTATUS = '1'
 WHERE E.I_EMPID <> '22'
 ORDER BY A.I_REQDATE DESC

The trick is to force the inner query return only one record by adding an aggregate function (I have used max() here). This will work perfectly as far as the query is concerned, but, honestly, OP should investigate why the inner query is returning multiple records by examining the data. Are these multiple records really relevant business wise?

Recommendation for compressing JPG files with ImageMagick

@JavisPerez -- Is there any way to compress that image to 150kb at least? Is that possible? What ImageMagick options can I use?

See the following links where there is an option in ImageMagick to specify the desired output file size for writing to JPG files.

http://www.imagemagick.org/Usage/formats/#jpg_write http://www.imagemagick.org/script/command-line-options.php#define

-define jpeg:extent={size} As of IM v6.5.8-2 you can specify a maximum output filesize for the JPEG image. The size is specified with a suffix. For example "400kb".

convert image.jpg -define jpeg:extent=150kb result.jpg

You will lose some quality by decompressing and recompressing in addition to any loss due to lowering -quality value from the input.

How to rsync only a specific list of files?

There is a flag --files-from that does exactly what you want. From man rsync:

--files-from=FILE
Using this option allows you to specify the exact list of files to transfer (as read from the specified FILE or - for standard input). It also tweaks the default behavior of rsync to make transferring just the specified files and directories easier:

The --relative (-R) option is implied, which preserves the path information that is specified for each item in the file (use --no-relative or --no-R if you want to turn that off).

The --dirs (-d) option is implied, which will create directories specified in the list on the destination rather than noisily skipping them (use --no-dirs or --no-d if you want to turn that off).

The --archive (-a) option’s behavior does not imply --recursive (-r), so specify it explicitly, if you want it.

These side-effects change the default state of rsync, so the position of the --files-from option on the command-line has no bearing on how other options are parsed (e.g. -a works the same before or after --files-from, as does --no-R and all other options).

The filenames that are read from the FILE are all relative to the source dir -- any leading slashes are removed and no ".." references are allowed to go higher than the source dir. For example, take this command:
rsync -a --files-from=/tmp/foo /usr remote:/backup
If /tmp/foo contains the string "bin" (or even "/bin"), the /usr/bin directory will be created as /backup/bin on the remote host. If it contains "bin/" (note the trailing slash), the immediate contents of the directory would also be sent (without needing to be explicitly mentioned in the file -- this began in version 2.6.4). In both cases, if the -r option was enabled, that dir’s entire hierarchy would also be transferred (keep in mind that -r needs to be specified explicitly with --files-from, since it is not implied by -a). Also note that the effect of the (enabled by default) --relative option is to duplicate only the path info that is read from the file -- it does not force the duplication of the source-spec path (/usr in this case).

In addition, the --files-from file can be read from the remote host instead of the local host if you specify a "host:" in front of the file (the host must match one end of the transfer). As a short-cut, you can specify just a prefix of ":" to mean "use the remote end of the transfer". For example:
rsync -a --files-from=:/path/file-list src:/ /tmp/copy
This would copy all the files specified in the /path/file-list file that was located on the remote "src" host.

If the --iconv and --protect-args options are specified and the --files-from filenames are being sent from one host to another, the filenames will be translated from the sending host’s charset to the receiving host’s charset.

NOTE: sorting the list of files in the --files-from input helps rsync to be more efficient, as it will avoid re-visiting the path elements that are shared between adjacent entries. If the input is not sorted, some path elements (implied directories) may end up being scanned multiple times, and rsync will eventually unduplicate them after they get turned into file-list elements.

Converting a Java Keystore into PEM Format

I found a very interesting solution:

http://www.swview.org/node/191

Then, I divided the pair public/private key into two files private.key publi.pem and it works!

How to find column names for all tables in all databases in SQL Server

I just realized that the following query would give you all column names from the table in your database (SQL SERVER 2017)

SELECT DISTINCT NAME FROM SYSCOLUMNS 
ORDER BY Name

OR SIMPLY

SELECT Name FROM SYSCOLUMNS

If you do not care about duplicated names.

Another option is SELECT Column names from INFORMATION_SCHEMA

SELECT DISTINCT column_name  FROM INFORMATION_SCHEMA.COLUMNS
ORDER BY column_name

It is usually more interesting to have the TableName as well as the ColumnName ant the query below does just that.

SELECT 
   Object_Name(Id) As TableName,
   Name As ColumnName
FROM SysColumns

And the results would look like

  TableName    ColumnName
0    Table1    column11
1    Table1    Column12
2    Table2    Column21
3    Table2    Column22
4    Table3    Column23

How to assign text size in sp value using java code

From Api level 1, you can use the public void setTextSize (float size) method.

From the documentation:

Set the default text size to the given value, interpreted as "scaled pixel" units. This size is adjusted based on the current density and user font size preference.

Parameters: size -> float: The scaled pixel size.

So you can simple do:

textView.setTextSize(12); // your size in sp

Modifying the "Path to executable" of a windows service

Slight modification to this @CodeMaker 's answer, for anyone like me who is trying to modify a MongoDB service to use authentication.

When I looked at the "Path to executable" in "Services" the executed line already contained speech marks. So I had to make minor modification to his example.

To be specific.

Type Services in Windows
Find MongoDB (or the service you want to change) and open the service, making sure to stop it.
Make a note of the Service Name (not the display name)
Look up and copy the "Path to executable" and copy it.

For me the path was (note the speech marks)

"C:\Program Files\MongoDB\Server\4.2\bin\mongod.exe" --config "C:\Program Files\MongoDB\Server\4.2\bin\mongod.cfg" --service

In a command line type

sc config MongoDB binPath= "<Modified string with \" to replace ">"

In my case this was

sc config MongoDB binPath= "\"C:\Program Files\MongoDB\Server\4.2\bin\mongod.exe\" --config \"C:\Program Files\MongoDB\Server\4.2\bin\mongod.cfg\" --service -- auth"

Android: Go back to previous activity

Are you wanting to take control of the back button behavior? You can override the back button (to go to a specific activity) via one of two methods.

For Android 1.6 and below:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        return true;
    }

    return super.onKeyDown(keyCode, event);
}

Or if you are only supporting Android 2.0 or greater:

@Override
public void onBackPressed() {
    // do something on back.
    return;
}

For more details: http://android-developers.blogspot.com/2009/12/back-and-other-hard-keys-three-stories.html

Adding horizontal spacing between divs in Bootstrap 3

The best solution is not to use the same element for column and panel:

<div class="row">
    <div class="col-md-3">
        <div class="panel" id="gameplay-away-team">Away Team</div>
    </div>
    <div class="col-md-6">
        <div class="panel" id="gameplay-baseball-field">Baseball Field</div>
    </div>
    <div class="col-md-3">
        <div class="panel" id="gameplay-home-team">Home Team</div>
    </div>
</div>

and some more styles:

#gameplay-baseball-field {
  padding-right: 10px;
  padding-left: 10px;
}

Convert array of strings into a string in Java

From Java 8, the simplest way I think is:

    String[] array = { "cat", "mouse" };
    String delimiter = "";
    String result = String.join(delimiter, array);

This way you can choose an arbitrary delimiter.

Changing background color of ListView items on Android

You can do This.

 final List<String> fruits_list = new ArrayList<String>(Arrays.asList(fruits));

    // Create an ArrayAdapter from List
    final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>
            (this, android.R.layout.simple_list_item_1, fruits_list){
        @Override
        public View getView(int position, View convertView, ViewGroup parent){
            // Get the current item from ListView
            View view = super.getView(position,convertView,parent);
            if(position %2 == 1)
            {
                // Set a background color for ListView regular row/item
                view.setBackgroundColor(Color.parseColor("#FFB6B546"));
            }
            else
            {
                // Set the background color for alternate row/item
                view.setBackgroundColor(Color.parseColor("#FFCCCB4C"));
            }
            return view;
        }
    };

    // DataBind ListView with items from ArrayAdapter
    lv.setAdapter(arrayAdapter);
}

}

Import Python Script Into Another?

I highly recommend the reading of a lecture in SciPy-lectures organization:

https://scipy-lectures.org/intro/language/reusing_code.html

It explains all the commented doubts.

But, new paths can be easily added and avoiding duplication with the following code:

import sys
new_path = 'insert here the new path'

if new_path not in sys.path:
    sys.path.append(new_path)
import funcoes_python #Useful python functions saved in a different script

Adding link a href to an element using css

No. Its not possible to add link through css. But you can use jquery

$('.case').each(function() {
  var link = $(this).html();
  $(this).contents().wrap('<a href="example.com/script.php?id="></a>');
});

Here the demo: http://jsfiddle.net/r5uWX/1/

Stop setInterval

You have to assign the returned value of the setInterval function to a variable

var interval;
$(document).on('ready',function(){
    interval = setInterval(updateDiv,3000);
});

and then use clearInterval(interval) to clear it again.

C++ Array Of Pointers

For example, if you want an array of int pointers it will be int* a[10]. It means that variable a is a collection of 10 int* s.

EDIT

I guess this is what you want to do:

class Bar
{
};

class Foo
{
public:

    //Takes number of bar elements in the pointer array
    Foo(int size_in);

    ~Foo();
    void add(Bar& bar);
private:

    //Pointer to bar array
    Bar** m_pBarArr;

    //Current fee bar index
    int m_index;
};

Foo::Foo(int size_in) : m_index(0)
{
    //Allocate memory for the array of bar pointers
    m_pBarArr = new Bar*[size_in];
}

Foo::~Foo()
{
    //Notice delete[] and not delete
    delete[] m_pBarArr;
    m_pBarArr = NULL;
}

void Foo::add(Bar &bar)
{
    //Store the pointer into the array. 
    //This is dangerous, you are assuming that bar object
    //is valid even when you try to use it
    m_pBarArr[m_index++] = &bar;
}

Preferred way of loading resources in Java

I know it really late for another answer but I just wanted to share what helped me at the end. It will also load resources/files from the absolute path of the file system (not only the classpath's).

public class ResourceLoader {

    public static URL getResource(String resource) {
        final List<ClassLoader> classLoaders = new ArrayList<ClassLoader>();
        classLoaders.add(Thread.currentThread().getContextClassLoader());
        classLoaders.add(ResourceLoader.class.getClassLoader());

        for (ClassLoader classLoader : classLoaders) {
            final URL url = getResourceWith(classLoader, resource);
            if (url != null) {
                return url;
            }
        }

        final URL systemResource = ClassLoader.getSystemResource(resource);
        if (systemResource != null) {
            return systemResource;
        } else {
            try {
                return new File(resource).toURI().toURL();
            } catch (MalformedURLException e) {
                return null;
            }
        }
    }

    private static URL getResourceWith(ClassLoader classLoader, String resource) {
        if (classLoader != null) {
            return classLoader.getResource(resource);
        }
        return null;
    }

}

Convert array of strings to List<string>

Just use this constructor of List<T>. It accepts any IEnumerable<T> as an argument.

string[] arr = ...
List<string> list = new List<string>(arr);

Can I use CASE statement in a JOIN condition?

Yes, you can. Here is an example.

SELECT a.*
FROM TableA a
LEFT OUTER JOIN TableB j1 ON  (CASE WHEN LEN(COALESCE(a.NoBatiment, '')) = 3 
                                THEN RTRIM(a.NoBatiment) + '0' 
                                ELSE a.NoBatiment END ) = j1.ColumnName

When do you use Git rebase instead of Git merge?

It was explained many times what rebase and what merge is, but when should you use what?

When should you use rebase?

Rebase "lifts off" your changes and puts all the changes of the rebased branch into your current branch and then puts your changes on top of it. It therefore changes the history of your branch.

when you have not pushed the branch / no one else is working on it
you want your to see all your changes at one point together when merging back to the source branch
you want to avoid the auto-generated "merged .." commit messages

I said "you want to see all your changes at one place" because sometimes a merge operation puts all your changes together in one commit (some: merged from ... message). Rebase makes your change look like you made your commits all after each other with no one else doing something in between. This makes it easier to see, what you changed for your feature.

Make sure though, you use git merge feature-branch --ff-only to make sure there are no conflicts creating a single commit when you are merging your feature back to develop/master.

When should you use merge?

when you have pushed the branch / others are working on it too (rebase gets very complicated if others work on that branch too!)
you don't need the full history(*) / your feature doesn't have to have it's commits all in one place.

(*) you can avoid that your feature only gets one "merged .." commits by first merging the develop branch to your feature and then merging your feature back to develeop. This still gives you a "merged .." commit, but a least all the commits of your feature are still visible.

Reading RFID with Android phones

You can hijack your Android audio port using an Arduino board like this. Then, you have two options (as far as I'm concerned):

1) Buy another Arduino Shield that supports RFID. I haven't seen one that supports UHF so far.

2) Try to connect your Arduino hijack with a USB RFID reader and build some embedded hardware kit.

Right now, I'm working in the second option but with iPhone.

Storing and Retrieving ArrayList values from hashmap

The modern way (as of 2020) to add entries to a multimap (a map of lists) in Java is:

map.computeIfAbsent("apple", k -> new ArrayList<>()).add(2);
map.computeIfAbsent("apple", k -> new ArrayList<>()).add(3);

According to Map.computeIfAbsent docs:

If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.

Returns: the current (existing or computed) value associated with the specified key, or null if the computed value is null

The most idiomatic way to iterate a map of lists is using Map.forEach and Iterable.forEach:

map.forEach((k, l) -> l.forEach(v -> /* use k and v here */));

Or, as shown in other answers, a traditional for loop:

for (Map.Entry<String, List<Integer>> e : map.entrySet()) {
    String k = e.getKey();
    for (Integer v : e.getValue()) {
        /* use k and v here */
    }
}

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysql.sock' (2)

I have follow Wellington Lorindo posting. And My problem was solved.

Steps 1. run in terminal

ps ax | grep mysql

Result was

11200 ? Ssl 0:01 /usr/sbin/mysqld

11514 pts/0 S+ 0:00 grep mysql

Steps 2. Again type this

sudo service mysql start

And problem solved.

Thanks Wellington Lorindo

How do I auto-submit an upload form when a file is selected?

HTML

<form id="xtarget" action="upload.php">
<input type="file" id="xfilename">
</form>

JAVASCRIPT PURE

<script type="text/javascript">
window.onload = function() {
    document.getElementById("xfilename").onchange = function() {
        document.getElementById("xtarget").submit();
    }
};
</script>

How to create JSON string in JavaScript?

Use JSON.stringify:

> JSON.stringify({ asd: 'bla' });
'{"asd":"bla"}'

How can I kill a process by name instead of PID?

If you run GNOME, you can use the system monitor (System->Administration->System Monitor) to kill processes as you would under Windows. KDE will have something similar.

How can I use the HTML5 canvas element in IE?

The page is using excanvas - a JS library that simulates the canvas element using IE's VML renderer.

Note that in Internet Explorer 9, the canvas tag is supported natively! See MSDN docs for details...

jQuery: Count number of list elements?

try

$("#mylist").children().length

Django - Static file not found

In your cmd type command python manage.py findstatic --verbosity 2 static It will give the directory in which Django is looking for static files.If you have created a virtual environment then there will be a static folder inside this virtual_environment_name folder. VIRTUAL_ENVIRONMENT_NAME\Lib\site-packages\django\contrib\admin\static. On running the above 'findstatic' command if Django shows you this path then just paste all your static files in this static directory. In your html file use JINJA syntax for href and check for other inline css. If still there is an image src or url after giving JINJA syntax then prepend it with '/static'. This worked for me.

Invalid URI: The format of the URI could not be determined

The issue for me was that when i got some domain name, i had:

cloudsearch-..-..-xxx.aws.cloudsearch... [WRONG]

http://cloudsearch-..-..-xxx.aws.cloudsearch... [RIGHT]

hope this does the job for you :)

Simple WPF RadioButton Binding?

I created an attached property based on Aviad's Answer which doesn't require creating a new class

public static class RadioButtonHelper
{
    [AttachedPropertyBrowsableForType(typeof(RadioButton))]
    public static object GetRadioValue(DependencyObject obj) => obj.GetValue(RadioValueProperty);
    public static void SetRadioValue(DependencyObject obj, object value) => obj.SetValue(RadioValueProperty, value);
    public static readonly DependencyProperty RadioValueProperty =
        DependencyProperty.RegisterAttached("RadioValue", typeof(object), typeof(RadioButtonHelper), new PropertyMetadata(new PropertyChangedCallback(OnRadioValueChanged)));

    private static void OnRadioValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is RadioButton rb)
        {
            rb.Checked -= OnChecked;
            rb.Checked += OnChecked;
        }
    }

    public static void OnChecked(object sender, RoutedEventArgs e)
    {
        if (sender is RadioButton rb)
        {
            rb.SetCurrentValue(RadioBindingProperty, rb.GetValue(RadioValueProperty));
        }
    }

    [AttachedPropertyBrowsableForType(typeof(RadioButton))]
    public static object GetRadioBinding(DependencyObject obj) => obj.GetValue(RadioBindingProperty);
    public static void SetRadioBinding(DependencyObject obj, object value) => obj.SetValue(RadioBindingProperty, value);

    public static readonly DependencyProperty RadioBindingProperty =
        DependencyProperty.RegisterAttached("RadioBinding", typeof(object), typeof(RadioButtonHelper), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, new PropertyChangedCallback(OnRadioBindingChanged)));

    private static void OnRadioBindingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is RadioButton rb && rb.GetValue(RadioValueProperty).Equals(e.NewValue))
        {
            rb.SetCurrentValue(RadioButton.IsCheckedProperty, true);
        }
    }
}

usage :

<RadioButton GroupName="grp1" Content="Value 1"
    helpers:RadioButtonHelper.RadioValue="val1" helpers:RadioButtonHelper.RadioBinding="{Binding SelectedValue}"/>
<RadioButton GroupName="grp1" Content="Value 2"
    helpers:RadioButtonHelper.RadioValue="val2" helpers:RadioButtonHelper.RadioBinding="{Binding SelectedValue}"/>
<RadioButton GroupName="grp1" Content="Value 3"
    helpers:RadioButtonHelper.RadioValue="val3" helpers:RadioButtonHelper.RadioBinding="{Binding SelectedValue}"/>
<RadioButton GroupName="grp1" Content="Value 4"
    helpers:RadioButtonHelper.RadioValue="val4" helpers:RadioButtonHelper.RadioBinding="{Binding SelectedValue}"/>

Differences between key, superkey, minimal superkey, candidate key and primary key

Superkey

A superkey is a combination of attributes that can be uniquely used to identify a 
database record. A table might have many superkeys.Candidate keys are a special subset
of superkeys that do not have any extraneous information in them.

Examples: Imagine a table with the fields <Name>, <Age>, <SSN> and <Phone Extension>.
This table has many possible superkeys. Three of these are <SSN>, <Phone Extension, Name>
and <SSN, Name>.Of those listed, only <SSN> is a **candidate key**, as the others
contain information not necessary to uniquely identify records.

C# Sort and OrderBy comparison

I think it's important to note another difference between Sort and OrderBy:

Suppose there exists a Person.CalculateSalary() method, which takes a lot of time; possibly more than even the operation of sorting a large list.

Compare

// Option 1
persons.Sort((p1, p2) => Compare(p1.CalculateSalary(), p2.CalculateSalary()));
// Option 2
var query = persons.OrderBy(p => p.CalculateSalary());

Option 2 may have superior performance, because it only calls the CalculateSalary method n times, whereas the Sort option might call CalculateSalary up to 2n log(n) times, depending on the sort algorithm's success.

Best way to get the max value in a Spark dataframe column

First add the import line:

from pyspark.sql.functions import min, max

To find the min value of age in the dataframe:

df.agg(min("age")).show()

+--------+
|min(age)|
+--------+
|      29|
+--------+

To find the max value of age in the dataframe:

df.agg(max("age")).show()

+--------+
|max(age)|
+--------+
|      77|
+--------+

How can I set a dynamic model name in AngularJS?

To make the answer provided by @abourget more complete, the value of scopeValue[field] in the following line of code could be undefined. This would result in an error when setting subfield:

<textarea ng-model="scopeValue[field][subfield]"></textarea>

One way of solving this problem is by adding an attribute ng-focus="nullSafe(field)", so your code would look like the below:

<textarea ng-focus="nullSafe(field)" ng-model="scopeValue[field][subfield]"></textarea>

Then you define nullSafe( field ) in a controller like the below:

$scope.nullSafe = function ( field ) {
  if ( !$scope.scopeValue[field] ) {
    $scope.scopeValue[field] = {};
  }
};

This would guarantee that scopeValue[field] is not undefined before setting any value to scopeValue[field][subfield].

Note: You can't use ng-change="nullSafe(field)" to achieve the same result because ng-change happens after the ng-model has been changed, which would throw an error if scopeValue[field] is undefined.

Flutter does not find android sdk

To open Tools=> Android Sdk Click SDK tools tab => check show package details and check all 28 SDK version install that and to fix the issue

How do I generate a SALT in Java for Salted-Hash?

Here's my solution, i would love anyone's opinion on this, it's simple for beginners

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Base64;
import java.util.Base64.Encoder;
import java.util.Scanner;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;

public class Cryptography {

    public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException {
        Encoder encoder = Base64.getUrlEncoder().withoutPadding();
        System.out.print("Password: ");
        String strPassword = new Scanner(System.in).nextLine();
        byte[] bSalt = Salt();
        String strSalt = encoder.encodeToString(bSalt); // Byte to String
        System.out.println("Salt: " + strSalt);
        System.out.println("String to be hashed: " + strPassword + strSalt);
        String strHash = encoder.encodeToString(Hash(strPassword, bSalt)); // Byte to String
        System.out.println("Hashed value (Password + Salt value): " + strHash);
    }

    private static byte[] Salt() {
        SecureRandom random = new SecureRandom();
        byte salt[] = new byte[6];
        random.nextBytes(salt);
        return salt;
    }

    private static byte[] Hash(String password, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException {
        KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 65536, 128);
        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        byte[] hash = factory.generateSecret(spec).getEncoded();
        return hash;
    }

}

You can validate by just decoding the strSalt and using the same hash method:

public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException {
        Encoder encoder = Base64.getUrlEncoder().withoutPadding();
        Decoder decoder = Base64.getUrlDecoder();
        System.out.print("Password: ");
        String strPassword = new Scanner(System.in).nextLine();
        String strSalt = "Your Salt String Here";
        byte[] bSalt = decoder.decode(strSalt); // String to Byte
        System.out.println("Salt: " + strSalt);
        System.out.println("String to be hashed: " + strPassword + strSalt);
        String strHash = encoder.encodeToString(Hash(strPassword, bSalt)); // Byte to String
        System.out.println("Hashed value (Password + Salt value): " + strHash);
    }

How to start an application using android ADB tools?

open ~/.bash_profile and add these bash functions to the end of the file

function androidinstall(){
   adb install -r ./bin/$1.apk
}
function androidrun(){
   ant clean debug
   adb shell am start -n $1/$1.$2
}

then open the Android project folder

androidinstall app-debug && androidrun com.example.app MainActivity

Best way to get application folder path

In my experience, the best way is a combination of these.

System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase Will give you the bin folder
Directory.GetCurrentDirectory() Works fine on .Net Core but not .Net and will give you the root directory of the project
System.AppContext.BaseDirectory and AppDomain.CurrentDomain.BaseDirectory Works fine in .Net but not .Net core and will give you the root directory of the project

In a class library that is supposed to target.Net and .Net core I check which framework is hosting the library and pick one or the other.

Check if boolean is true?

Neither is "more correct". My personal preference is for the more concise form but either is fine. To me, life is too short to even think about arguing the toss over stuff like this.

Copy array by value

No jQuery needed... Working Example

var arr2 = arr1.slice()

This copys the array from the starting position 0 through the end of the array.

It is important to note that it will work as expected for primitive types (string, number, etc.), and to also explain the expected behavior for reference types...

If you have an array of Reference types, say of type Object. The array will be copied, but both of the arrays will contain references to the same Object's. So in this case it would seem like the array is copied by reference even though the array is actually copied.

Save results to csv file with Python

I know the question is asking about your "csv" package implementation, but for your information, there are options that are much simpler — numpy, for instance.

import numpy as np
np.savetxt('data.csv', (col1_array, col2_array, col3_array), delimiter=',')

(This answer posted 6 years later, for posterity's sake.)

In a different case similar to what you're asking about, say you have two columns like this:

names = ['Player Name', 'Foo', 'Bar']
scores = ['Score', 250, 500]

You could save it like this:

np.savetxt('scores.csv', [p for p in zip(names, scores)], delimiter=',', fmt='%s')

scores.csv would look like this:

Player Name,Score
Foo,250
Bar,500

The conversion of a datetime2 data type to a datetime data type resulted in an out-of-range value

In my case, in the initializer from the class I was using in the database's table, I wasn't setting any default value to my DateTime property, therefore resulting in the problem explained in @Andrew Orsich' answer. So I just made the property nullable. Or I could also have given it DateTime.Now in the constructor. Hope it helps someone.

Initializing a member array in constructor initializer

No, unfortunately.
You just can't in the way you want, as it's not allowed by the grammar (more below). You can only use ctor-like initialization, and, as you know, that's not available for initializing each item in arrays.
I believe so, as they generalize initialization across the board in many useful ways. But I'm not sure on the details.

In C++03, aggregate initialization only applies with syntax similar as below, which must be a separate statement and doesn't fit in a ctor initializer.

T var = {...};

FileSystemWatcher Changed event is raised twice

Alot of these answers are shocking, really. Heres some code from my XanderUI Control library that fixes this.

private void OnChanged(object sender, FilesystemEventArgs e)
{
    if (FSWatcher.IncludeSubdirectories == true)
    {
        if (File.Exists(e.FullPath)) { DO YOUR FILE CHANGE STUFF HERE... }
    }
    else DO YOUR DIRECTORY CHANGE STUFF HERE...
}

using wildcards in LDAP search filters/queries

Your best bet would be to anticipate prefixes, so:

"(|(displayName=SEARCHKEY*)(displayName=ITSM - SEARCHKEY*)(displayName=alt prefix - SEARCHKEY*))"

Clunky, but I'm doing a similar thing within my organization.

How do I run a command on an already existing Docker container?

If you are trying to run shell script, you need run it as bash.

docker exec -it containerid bash -c /path/to/your/script.sh

ListView with OnItemClickListener

In Java as other suggest

listitem.setClickable(false);

Or in xml:

android:clickable="false"

It works very fine

How to insert a row between two rows in an existing excel with HSSF (Apache POI)

As to formulas being "updated" in the new row, since all the copying occurs after the shift, the old row (now one index up from the new row) has already had its formula shifted, so copying it to the new row will make the new row reference the old rows cells. A solution would be to parse out the formulas BEFORE the shift, then apply those (a simple String array would do the job. I'm sure you can code that in a few lines).

At start of function:

ArrayList<String> fArray = new ArrayList<String>();
Row origRow = sheet.getRow(sourceRow);
for (int i = 0; i < origRow.getLastCellNum(); i++) {
    if (origRow.getCell(i) != null && origRow.getCell(i).getCellType() == Cell.CELL_TYPE_FORMULA) 
        fArray.add(origRow.getCell(i).getCellFormula());
    else fArray.add(null);
}

Then when applying the formula to a cell:

newCell.setCellFormula(fArray.get(i));

How to connect access database in c#

You are building a DataGridView on the fly and set the DataSource for it. That's good, but then do you add the DataGridView to the Controls collection of the hosting form?

this.Controls.Add(dataGridView1);

By the way the code is a bit confused

String connection = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\\Tables.accdb;Persist Security Info=True";
string sql  = "SELECT Clients  FROM Tables";
using(OleDbConnection conn = new OleDbConnection(connection))
{
     conn.Open();
     DataSet ds = new DataSet();
     DataGridView dataGridView1 = new DataGridView();
     using(OleDbDataAdapter adapter = new OleDbDataAdapter(sql,conn))
     {
         adapter.Fill(ds);
         dataGridView1.DataSource = ds;
         // Of course, before addint the datagrid to the hosting form you need to 
         // set position, location and other useful properties. 
         // Why don't you create the DataGrid with the designer and use that instance instead?
         this.Controls.Add(dataGridView1);
     }
}

EDIT After the comments below it is clear that there is a bit of confusion between the file name (TABLES.ACCDB) and the name of the table CLIENTS.
The SELECT statement is defined (in its basic form) as

 SELECT field_names_list FROM _tablename_

so the correct syntax to use for retrieving all the clients data is

 string sql  = "SELECT * FROM Clients";

where the * means -> all the fields present in the table

How do I add an image to a JButton

This code work for me:

    BufferedImage image = null;
    try {
        URL file = getClass().getResource("water.bmp");
        image = ImageIO.read(file);
    } catch (IOException ioex) {
        System.err.println("load error: " + ioex.getMessage());
    }
    ImageIcon icon = new ImageIcon(image);
    JButton quitButton = new JButton(icon);

Find the nth occurrence of substring in a string

This will give you an array of the starting indices for matches to yourstring:

import re
indices = [s.start() for s in re.finditer(':', yourstring)]

Then your nth entry would be:

n = 2
nth_entry = indices[n-1]

Of course you have to be careful with the index bounds. You can get the number of instances of yourstring like this:

num_instances = len(indices)

How to join entries in a set into one string?

I think you just have it backwards.

print ", ".join(set_3)

Android "gps requires ACCESS_FINE_LOCATION" error, even though my manifest file contains this

ACCESS_COARSE_LOCATION, ACCESS_FINE_LOCATION, and WRITE_EXTERNAL_STORAGE are all part of the Android 6.0 runtime permission system. In addition to having them in the manifest as you do, you also have to request them from the user at runtime (using requestPermissions()) and see if you have them (using checkSelfPermission()).

One workaround in the short term is to drop your targetSdkVersion below 23.

But, eventually, you will want to update your app to use the runtime permission system.

For example, this activity works with five permissions. Four are runtime permissions, though it is presently only handling three (I wrote it before WRITE_EXTERNAL_STORAGE was added to the runtime permission roster).

/***
 Copyright (c) 2015 CommonsWare, LLC
 Licensed under the Apache License, Version 2.0 (the "License"); you may not
 use this file except in compliance with the License. You may obtain a copy
 of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
 by applicable law or agreed to in writing, software distributed under the
 License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
 OF ANY KIND, either express or implied. See the License for the specific
 language governing permissions and limitations under the License.

 From _The Busy Coder's Guide to Android Development_
 https://commonsware.com/Android
 */

package com.commonsware.android.permmonger;

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
  private static final String[] INITIAL_PERMS={
    Manifest.permission.ACCESS_FINE_LOCATION,
    Manifest.permission.READ_CONTACTS
  };
  private static final String[] CAMERA_PERMS={
    Manifest.permission.CAMERA
  };
  private static final String[] CONTACTS_PERMS={
      Manifest.permission.READ_CONTACTS
  };
  private static final String[] LOCATION_PERMS={
      Manifest.permission.ACCESS_FINE_LOCATION
  };
  private static final int INITIAL_REQUEST=1337;
  private static final int CAMERA_REQUEST=INITIAL_REQUEST+1;
  private static final int CONTACTS_REQUEST=INITIAL_REQUEST+2;
  private static final int LOCATION_REQUEST=INITIAL_REQUEST+3;
  private TextView location;
  private TextView camera;
  private TextView internet;
  private TextView contacts;
  private TextView storage;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    location=(TextView)findViewById(R.id.location_value);
    camera=(TextView)findViewById(R.id.camera_value);
    internet=(TextView)findViewById(R.id.internet_value);
    contacts=(TextView)findViewById(R.id.contacts_value);
    storage=(TextView)findViewById(R.id.storage_value);

    if (!canAccessLocation() || !canAccessContacts()) {
      requestPermissions(INITIAL_PERMS, INITIAL_REQUEST);
    }
  }

  @Override
  protected void onResume() {
    super.onResume();

    updateTable();
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.actions, menu);

    return(super.onCreateOptionsMenu(menu));
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch(item.getItemId()) {
      case R.id.camera:
        if (canAccessCamera()) {
          doCameraThing();
        }
        else {
          requestPermissions(CAMERA_PERMS, CAMERA_REQUEST);
        }
        return(true);

      case R.id.contacts:
        if (canAccessContacts()) {
          doContactsThing();
        }
        else {
          requestPermissions(CONTACTS_PERMS, CONTACTS_REQUEST);
        }
        return(true);

      case R.id.location:
        if (canAccessLocation()) {
          doLocationThing();
        }
        else {
          requestPermissions(LOCATION_PERMS, LOCATION_REQUEST);
        }
        return(true);
    }

    return(super.onOptionsItemSelected(item));
  }

  @Override
  public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    updateTable();

    switch(requestCode) {
      case CAMERA_REQUEST:
        if (canAccessCamera()) {
          doCameraThing();
        }
        else {
          bzzzt();
        }
        break;

      case CONTACTS_REQUEST:
        if (canAccessContacts()) {
          doContactsThing();
        }
        else {
          bzzzt();
        }
        break;

      case LOCATION_REQUEST:
        if (canAccessLocation()) {
          doLocationThing();
        }
        else {
          bzzzt();
        }
        break;
    }
  }

  private void updateTable() {
    location.setText(String.valueOf(canAccessLocation()));
    camera.setText(String.valueOf(canAccessCamera()));
    internet.setText(String.valueOf(hasPermission(Manifest.permission.INTERNET)));
    contacts.setText(String.valueOf(canAccessContacts()));
    storage.setText(String.valueOf(hasPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)));
  }

  private boolean canAccessLocation() {
    return(hasPermission(Manifest.permission.ACCESS_FINE_LOCATION));
  }

  private boolean canAccessCamera() {
    return(hasPermission(Manifest.permission.CAMERA));
  }

  private boolean canAccessContacts() {
    return(hasPermission(Manifest.permission.READ_CONTACTS));
  }

  private boolean hasPermission(String perm) {
    return(PackageManager.PERMISSION_GRANTED==checkSelfPermission(perm));
  }

  private void bzzzt() {
    Toast.makeText(this, R.string.toast_bzzzt, Toast.LENGTH_LONG).show();
  }

  private void doCameraThing() {
    Toast.makeText(this, R.string.toast_camera, Toast.LENGTH_SHORT).show();
  }

  private void doContactsThing() {
    Toast.makeText(this, R.string.toast_contacts, Toast.LENGTH_SHORT).show();
  }

  private void doLocationThing() {
    Toast.makeText(this, R.string.toast_location, Toast.LENGTH_SHORT).show();
  }
}

(from this sample project)

For the requestPermissions() function, should the parameters just be "ACCESS_COARSE_LOCATION"? Or should I include the full name "android.permission.ACCESS_COARSE_LOCATION"?

I would use the constants defined on Manifest.permission, as shown above.

Also, what is the request code?

That will be passed back to you as the first parameter to onRequestPermissionsResult(), so you can tell one requestPermissions() call from another.

Keylistener in Javascript

Here's an update for modern browsers in 2019

_x000D_

let playerSpriteX = 0;_x000D_
_x000D_
document.addEventListener('keyup', (e) => {_x000D_
  if (e.code === "ArrowUp")        playerSpriteX += 10_x000D_
  else if (e.code === "ArrowDown") playerSpriteX -= 10_x000D_
_x000D_
  document.getElementById('test').innerHTML = 'playerSpriteX = ' + playerSpriteX;_x000D_
});

_x000D_

Click on this window to focus it, and hit keys up and down_x000D_
<br><br><br>_x000D_
<div id="test">playerSpriteX = 0</div>

_x000D_

Original answer from 2013

window.onkeyup = function(e) {
   var key = e.keyCode ? e.keyCode : e.which;

   if (key == 38) {
       playerSpriteX += 10;
   }else if (key == 40) {
       playerSpriteX -= 10;
   }
}

FIDDLE

Delete with "Join" in Oracle sql Query

Use a subquery in the where clause. For a delete query requirig a join, this example will delete rows that are unmatched in the joined table "docx_document" and that have a create date > 120 days in the "docs_documents" table.

delete from docs_documents d
where d.id in (
    select a.id from docs_documents a
    left join docx_document b on b.id = a.document_id
    where b.id is null
        and floor(sysdate - a.create_date) > 120
 );

How do I use valgrind to find memory leaks?

Try this:

valgrind --leak-check=full -v ./your_program

As long as valgrind is installed it will go through your program and tell you what's wrong. It can give you pointers and approximate places where your leaks may be found. If you're segfault'ing, try running it through gdb.

HTML list-style-type dash

For anyone having this problem today, the solution is simply:

list-style: "- "

.htaccess or .htpasswd equivalent on IIS?

This is the documentation that you want: http://msdn.microsoft.com/en-us/library/aa292114(VS.71).aspx

I guess the answer is, yes, there is an equivalent that will accomplish the same thing, integrated with Windows security.

How to discover number of logical cores on Mac OS X?

This should be cross platform. At least for Linux and Mac OS X.

python -c 'import multiprocessing as mp; print(mp.cpu_count())'

A little bit slow but works.

Pushing to Git returning Error Code 403 fatal: HTTP request failed

I figured out my own variation of this problem.

The issue was not changing the protocol from https to ssl, but instead, setting the Github global username and email! (I was trying to push to a private repository.

git config --global user.email "[email protected]"

git config --global user.name "Your full name"

Better way to sum a property value in an array

It's working for me in TypeScript and JavaScript:

_x000D_

let lst = [_x000D_
     { description:'Senior', price: 10},_x000D_
     { description:'Adult', price: 20},_x000D_
     { description:'Child', price: 30}_x000D_
];_x000D_
let sum = lst.map(o => o.price).reduce((a, c) => { return a + c });_x000D_
console.log(sum);

_x000D_

I hope is useful.

ASP.NET MVC Return Json Result?

It should be :

public async Task<ActionResult> GetSomeJsonData()
{
    var model = // ... get data or build model etc.

    return Json(new { Data = model }, JsonRequestBehavior.AllowGet); 
}

or more simply:

return Json(model, JsonRequestBehavior.AllowGet);

I did notice that you are calling GetResources() from another ActionResult which wont work. If you are looking to get JSON back, you should be calling GetResources() from ajax directly...

Send Outlook Email Via Python?

Check via Google, there are lots of examples, see here for one.

Inlined for ease of viewing:

import win32com.client

def send_mail_via_com(text, subject, recipient, profilename="Outlook2003"):
    s = win32com.client.Dispatch("Mapi.Session")
    o = win32com.client.Dispatch("Outlook.Application")
    s.Logon(profilename)

    Msg = o.CreateItem(0)
    Msg.To = recipient

    Msg.CC = "moreaddresses here"
    Msg.BCC = "address"

    Msg.Subject = subject
    Msg.Body = text

    attachment1 = "Path to attachment no. 1"
    attachment2 = "Path to attachment no. 2"
    Msg.Attachments.Add(attachment1)
    Msg.Attachments.Add(attachment2)

    Msg.Send()

How to put spacing between floating divs?

Add margin to your div style

margin:0 10px 10px 0;

http://www.w3schools.com/css/css_margin.asp

How to dynamically add a style for text-align using jQuery

<!DOCTYPE html>
<html>
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
    <script>
      $( document ).ready(function() {
      $this = $('h1');
         $this.css('color','#3498db');
         $this.css('text-align','center');
         $this.css('border','1px solid #ededed');
      });
    </script>

  </head>
  <body>
      <h1>Title</h1>
 </body>
</html>

How to change cursor from pointer to finger using jQuery?

Update! New & improved! Find plugin @ GitHub!

On another note, while that method is simple, I've created a jQuery plug (found at this jsFiddle, just copy and past code between comment lines) that makes changing the cursor on any element as simple as $("element").cursor("pointer").

But that's not all! Act now and you'll get the hand functions position & ishover for no extra charge! That's right, 2 very handy cursor functions ... FREE!

They work as simple as seen in the demo:

$("h3").cursor("isHover"); // if hovering over an h3 element, will return true, 
    // else false
// also handy as
$("h2, h3").cursor("isHover"); // unless your h3 is inside an h2, this will be 
    // false as it checks to see if cursor is hovered over both elements, not just the last!
//  And to make this deal even sweeter - use the following to get a jQuery object
//       of ALL elements the cursor is currently hovered over on demand!
$.cursor("isHover");

Also:

$.cursor("position"); // will return the current cursor position as { x: i, y: i }
    // at anytime you call it!

Supplies are limited, so Act Now!

How to write a test which expects an Error to be thrown in Jasmine?

I replace Jasmine's toThrow matcher with the following, which lets you match on the exception's name property or its message property. For me this makes tests easier to write and less brittle, as I can do the following:

throw {
   name: "NoActionProvided",
   message: "Please specify an 'action' property when configuring the action map."
}

and then test with the following:

expect (function () {
   .. do something
}).toThrow ("NoActionProvided");

This lets me tweak the exception message later without breaking tests, when the important thing is that it threw the expected type of exception.

This is the replacement for toThrow that allows this:

jasmine.Matchers.prototype.toThrow = function(expected) {
  var result = false;
  var exception;
  if (typeof this.actual != 'function') {
    throw new Error('Actual is not a function');
  }
  try {
    this.actual();
  } catch (e) {
    exception = e;
  }
  if (exception) {
      result = (expected === jasmine.undefined || this.env.equals_(exception.message || exception, expected.message || expected) || this.env.equals_(exception.name, expected));
  }

  var not = this.isNot ? "not " : "";

  this.message = function() {
    if (exception && (expected === jasmine.undefined || !this.env.equals_(exception.message || exception, expected.message || expected))) {
      return ["Expected function " + not + "to throw", expected ? expected.name || expected.message || expected : " an exception", ", but it threw", exception.name || exception.message || exception].join(' ');
    } else {
      return "Expected function to throw an exception.";
    }
  };

  return result;
};

How to get First and Last record from a sql query?

In some cases - when not so many columns - useful the WINDOW functions FIRST_VALUE() and LAST_VALUE().

 SELECT
    FIRST_VALUE(timestamp) over (ORDER BY timestamp ASC) as created_dt,
    LAST_VALUE(timestamp) over (ORDER BY timestamp ASC) as last_update_dt,
    LAST_VALUE(action) over (ORDER BY timestamp ASC) as last_action
FROM events

This query sort data only once.

It can be used for getting fisrt and last rows by some ID

SELECT DISTINCT
    order_id,
    FIRST_VALUE(timestamp) over (PARTITION BY order_id ORDER BY timestamp ASC) as created_dt,
    LAST_VALUE(timestamp) over (PARTITION BY order_id ORDER BY timestamp ASC) as last_update_dt,
    LAST_VALUE(action) over (PARTITION BY order_id ORDER BY timestamp ASC) as last_action

FROM events as x

What is Dependency Injection and Inversion of Control in Spring Framework?

How to upgrade docker container after its image changed

Consider for this answers:

The database name is app_schema
The container name is app_db
The root password is root123

How to update MySQL when storing application data inside the container

This is considered a bad practice, because if you lose the container, you will lose the data. Although it is a bad practice, here is a possible way to do it:

1) Do a database dump as SQL:

docker exec app_db sh -c 'exec mysqldump app_schema -uroot -proot123' > database_dump.sql

2) Update the image:

docker pull mysql:5.6

3) Update the container:

docker rm -f app_db
docker run --name app_db --restart unless-stopped \
-e MYSQL_ROOT_PASSWORD=root123 \
-d mysql:5.6

4) Restore the database dump:

docker exec app_db sh -c 'exec mysql -uroot -proot123' < database_dump.sql

How to update MySQL container using an external volume

Using an external volume is a better way of managing data, and it makes easier to update MySQL. Loosing the container will not lose any data. You can use docker-compose to facilitate managing multi-container Docker applications in a single host:

1) Create the docker-compose.yml file in order to manage your applications:

version: '2'
services:
  app_db:
    image: mysql:5.6
    restart: unless-stopped
    volumes_from: app_db_data
  app_db_data:
    volumes: /my/data/dir:/var/lib/mysql

2) Update MySQL (from the same folder as the docker-compose.yml file):

docker-compose pull
docker-compose up -d

Note: the last command above will update the MySQL image, recreate and start the container with the new image.

How to backup MySQL database in PHP?

Try out following example of using SELECT INTO OUTFILE query for creating table backup. This will only backup a particular table.

<?php
   $dbhost = 'localhost:3036';
   $dbuser = 'root';
   $dbpass = 'rootpassword';

   $conn = mysql_connect($dbhost, $dbuser, $dbpass);

   if(! $conn ) {
      die('Could not connect: ' . mysql_error());
   }

   $table_name = "employee";
   $backup_file  = "/tmp/employee.sql";
   $sql = "SELECT * INTO OUTFILE '$backup_file' FROM $table_name";

   mysql_select_db('test_db');
   $retval = mysql_query( $sql, $conn );

   if(! $retval ) {
      die('Could not take data backup: ' . mysql_error());
   }

   echo "Backedup  data successfully\n";

   mysql_close($conn);
?>

What is sharding and why is it important?

Is sharding mostly important in very large scale applications or does it apply to smaller scale ones?

Sharding is a concern if and only if your needs scale past what can be served by a single database server. It's a swell tool if you have shardable data and you have incredibly high scalability and performance requirements. I would guess that in my entire 12 years I've been a software professional, I've encountered one situation that could have benefited from sharding. It's an advanced technique with very limited applicability.

Besides, the future is probably going to be something fun and exciting like a massive object "cloud" that erases all potential performance limitations, right? :)

Timeout for python requests.get entire response

I came up with a more direct solution that is admittedly ugly but fixes the real problem. It goes a bit like this:

resp = requests.get(some_url, stream=True)
resp.raw._fp.fp._sock.settimeout(read_timeout)
# This will load the entire response even though stream is set
content = resp.content

You can read the full explanation here

Execute a PHP script from another PHP script

If it is a linux box you would run something like:

php /folder/script.php

On Windows, you would need to make sure your php.exe file is part of your PATH, and do a similar approach to the file you want to run:

php C:\folder\script.php

How do you create a Swift Date object?

Personally I think it should be a failable initialiser:

extension Date {

    init?(dateString: String) {
        let dateStringFormatter = DateFormatter()
        dateStringFormatter.dateFormat = "yyyy-MM-dd"
        if let d = dateStringFormatter.date(from: dateString) {
            self.init(timeInterval: 0, since: d)
        } else {
            return nil
        }
    }
}

Otherwise a string with an invalid format will raise an exception.

iPhone - Grand Central Dispatch main thread

One place where it's useful is for UI activities, like setting a spinner before a lengthy operation:

- (void) handleDoSomethingButton{

    [mySpinner startAnimating];

    (do something lengthy)
    [mySpinner stopAnimating];
}

will not work, because you are blocking the main thread during your lengthy thing and not letting UIKit actually start the spinner.

- (void) handleDoSomethingButton{
     [mySpinner startAnimating];

     dispatch_async (dispatch_get_main_queue(), ^{
          (do something lengthy)
          [mySpinner stopAnimating];
    });
}

will return control to the run loop, which will schedule UI updating, starting the spinner, then will get the next thing off the dispatch queue, which is your actual processing. When your processing is done, the animation stop is called, and you return to the run loop, where the UI then gets updated with the stop.

Passing a 2D array to a C++ function

In the case you want to pass a dynamic sized 2-d array to a function, using some pointers could work for you.

void func1(int *arr, int n, int m){
    ...
    int i_j_the_element = arr[i * m + j];  // use the idiom of i * m + j for arr[i][j] 
    ...
}

void func2(){
    ...
    int arr[n][m];
    ...
    func1(&(arr[0][0]), n, m);
}

Disabling Log4J Output in Java

 log4j.rootLogger=OFF

Spring MVC - HttpMediaTypeNotAcceptableException

For me the problem was the URL I was trying to access. I had url like this:

{{ip}}:{{port}}/{{path}}/person.html

When you end url with .html it means that you will not accept any other payload than html. I needed to remove .html from the end for my endpoint to work properly. (You can also append .json at the end of url and it will work too)

Additionally your url-pattern in web.xml need to be configured properly to allow you to access the resource. For me it is

<servlet-mapping>
        <servlet-name>spring-mvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

Previously I had *.html* and it was preventing me an access to the endpoint.

How to manipulate arrays. Find the average. Beginner Java

Try this way

public void average(int[] data) {  
    int sum = 0;
    double average;

    for(int i=0; i < data.length; i++){
        sum = sum + data[i];
    }
    average = (double)sum/data.length;
    System.out.println("Average value of array element is " + average);    
}

if you need to return average value you need to use double key word Instead of the void key word and need to return value return average.

public double average(int[] data) {  
    int sum = 0;
    double average;

    for(int i=0; i < data.length; i++){
        sum = sum + data[i];
    }
    average = (double)sum/data.length;
    return average;    
}

How to convert List to Json in Java

You need an external library for this.

JSONArray jsonA = JSONArray.fromObject(mybeanList);
System.out.println(jsonA);

Google GSON is one of such libraries

You can also take a look here for examples on converting Java object collection to JSON string.

Converting Numpy Array to OpenCV Array

The simplest solution would be to use Pillow lib:

from PIL import Image

image = Image.fromarray(<your_numpy_array>.astype(np.uint8))

And you can use it as an image.

Selecting rows where remainder (modulo) is 1 after division by 2?

MySQL, SQL Server, PostgreSQL, SQLite support using the percent sign as the modulus:

WHERE column % 2 = 1

For Oracle, you have to use the MOD function:

WHERE MOD(column, 2) = 1

Ordering issue with date values when creating pivot tables

If you want to use a column with 24/11/15 (for 24th November 2015) in your Pivot that will sort correctly, you can make sure it is properly formatted by doing the following - highlight the column, go to Data – Text to Columns – click Next twice, then select “Date” and use the default of DMY (or select as applicable to your data) and click ok

When you pivot now you should see it sorting properly as we have properly formatted that column to be a date field so Excel can work with it

jQuery load first 3 elements, click "load more" to display next 5 elements

The expression $(document).ready(function() deprecated in jQuery3.

See working fiddle with jQuery 3 here

Take into account I didn't include the showless button.

Here's the code:

$(function () {
    x=3;
    $('#myList li').slice(0, 3).show();
    $('#loadMore').on('click', function (e) {
        e.preventDefault();
        x = x+5;
        $('#myList li').slice(0, x).slideDown();
    });
});

CSS

#myList li{display:none;
}
#loadMore {
    color:green;
    cursor:pointer;
}
#loadMore:hover {
    color:black;
}

How to log PostgreSQL queries?

You should also set this parameter to log every statement:

log_min_duration_statement = 0

How do I install command line MySQL client on mac?

Using MacPorts you can install the client with:

sudo port install mysql57

You also need to select the installed version as your mysql

sudo port select mysql mysql57

The server is only installed if you append -server to the package name (e.g. mysql57-server)

How to check if a String is numeric in Java

Here is my class for checking if a string is numeric. It also fixes numerical strings:

Features:

Removes unnecessary zeros ["12.0000000" -> "12"]
Removes unnecessary zeros ["12.0580000" -> "12.058"]
Removes non numerical characters ["12.00sdfsdf00" -> "12"]
Handles negative string values ["-12,020000" -> "-12.02"]
Removes multiple dots ["-12.0.20.000" -> "-12.02"]
No extra libraries, just standard Java

Here you go...

public class NumUtils {
    /**
     * Transforms a string to an integer. If no numerical chars returns a String "0".
     *
     * @param str
     * @return retStr
     */
    static String makeToInteger(String str) {
        String s = str;
        double d;
        d = Double.parseDouble(makeToDouble(s));
        int i = (int) (d + 0.5D);
        String retStr = String.valueOf(i);
        System.out.printf(retStr + "   ");
        return retStr;
    }

    /**
     * Transforms a string to an double. If no numerical chars returns a String "0".
     *
     * @param str
     * @return retStr
     */
    static String makeToDouble(String str) {

        Boolean dotWasFound = false;
        String orgStr = str;
        String retStr;
        int firstDotPos = 0;
        Boolean negative = false;

        //check if str is null
        if(str.length()==0){
            str="0";
        }

        //check if first sign is "-"
        if (str.charAt(0) == '-') {
            negative = true;
        }

        //check if str containg any number or else set the string to '0'
        if (!str.matches(".*\\d+.*")) {
            str = "0";
        }

        //Replace ',' with '.'  (for some european users who use the ',' as decimal separator)
        str = str.replaceAll(",", ".");
        str = str.replaceAll("[^\\d.]", "");

        //Removes the any second dots
        for (int i_char = 0; i_char < str.length(); i_char++) {
            if (str.charAt(i_char) == '.') {
                dotWasFound = true;
                firstDotPos = i_char;
                break;
            }
        }
        if (dotWasFound) {
            String befDot = str.substring(0, firstDotPos + 1);
            String aftDot = str.substring(firstDotPos + 1, str.length());
            aftDot = aftDot.replaceAll("\\.", "");
            str = befDot + aftDot;
        }

        //Removes zeros from the begining
        double uglyMethod = Double.parseDouble(str);
        str = String.valueOf(uglyMethod);

        //Removes the .0
        str = str.replaceAll("([0-9])\\.0+([^0-9]|$)", "$1$2");

        retStr = str;

        if (negative) {
            retStr = "-"+retStr;
        }

        return retStr;

    }

    static boolean isNumeric(String str) {
        try {
            double d = Double.parseDouble(str);
        } catch (NumberFormatException nfe) {
            return false;
        }
        return true;
    }

}

How to pass a user / password in ansible command

As mentioned before you can use --extra-vars (-e) , but instead of specifying the pwd on the commandline so it doesn't end up in the history files you can save it to an environment variable. This way it also goes away when you close the session.

read -s PASS
ansible windows -i hosts -m win_ping -e "ansible_password=$PASS"

How to increase the distance between table columns in HTML?

There isn't any need for fake <td>s. Make use of border-spacing instead. Apply it like this:

HTML:

<table>
  <tr>
    <td>First Column</td>
    <td>Second Column</td>
    <td>Third Column</td>
  </tr>
</table>

CSS:

table {
  border-collapse: separate;
  border-spacing: 50px 0;
}

td {
  padding: 10px 0;
}

See it in action.

Squash the first two commits in Git?

Update July 2012 (git 1.7.12+)

You now can rebase all commits up to root, and select the second commit Y to be squashed with the first X.

git rebase -i --root master

pick sha1 X
squash sha1 Y
pick sha1 Z

git rebase [-i] --root $tip
This command can now be used to rewrite all the history leading from "$tip" down to the root commit.

See commit df5df20c1308f936ea542c86df1e9c6974168472 on GitHub from Chris Webb (arachsys).

Original answer (February 2009)

I believe you will find different recipes for that in the SO question "How do I combine the first two commits of a git repository?"

Charles Bailey provided there the most detailed answer, reminding us that a commit is a full tree (not just diffs from a previous states).
And here the old commit (the "initial commit") and the new commit (result of the squashing) will have no common ancestor.
That mean you can not "commit --amend" the initial commit into new one, and then rebase onto the new initial commit the history of the previous initial commit (lots of conflicts)

(That last sentence is no longer true with git rebase -i --root <aBranch>)

Rather (with A the original "initial commit", and B a subsequent commit needed to be squashed into the initial one):

Go back to the last commit that we want to form the initial commit (detach HEAD):
```
git checkout <sha1_for_B>
```
Reset the branch pointer to the initial commit, but leaving the index and working tree intact:
```
git reset --soft <sha1_for_A>
```
Amend the initial tree using the tree from 'B':
```
git commit --amend
```
Temporarily tag this new initial commit (or you could remember the new commit sha1 manually):
```
git tag tmp
```
Go back to the original branch (assume master for this example):
```
git checkout master
```
Replay all the commits after B onto the new initial commit:
```
git rebase --onto tmp <sha1_for_B>
```
Remove the temporary tag:
```
git tag -d tmp
```

That way, the "rebase --onto" does not introduce conflicts during the merge, since it rebases history made after the last commit (B) to be squashed into the initial one (which was A) to tmp (representing the squashed new initial commit): trivial fast-forward merges only.

That works for "A-B", but also "A-...-...-...-B" (any number of commits can be squashed into the initial one this way)

adding comment in .properties files

Writing the properties file with multiple comments is not supported. Why ?

PropertyFile.java

public class PropertyFile extends Task {

    /* ========================================================================
     *
     * Instance variables.
     */

    // Use this to prepend a message to the properties file
    private String              comment;

    private Properties          properties;

The ant property file task is backed by a java.util.Properties class which stores comments using the store() method. Only one comment is taken from the task and that is passed on to the Properties class to save into the file.

The way to get around this is to write your own task that is backed by commons properties instead of java.util.Properties. The commons properties file is backed by a property layout which allows settings comments for individual keys in the properties file. Save the properties file with the save() method and modify the new task to accept multiple comments through <comment> elements.

What does "connection reset by peer" mean?

This means that a TCP RST was received and the connection is now closed. This occurs when a packet is sent from your end of the connection but the other end does not recognize the connection; it will send back a packet with the RST bit set in order to forcibly close the connection.

This can happen if the other side crashes and then comes back up or if it calls close() on the socket while there is data from you in transit, and is an indication to you that some of the data that you previously sent may not have been received.

It is up to you whether that is an error; if the information you were sending was only for the benefit of the remote client then it may not matter that any final data may have been lost. However you should close the socket and free up any other resources associated with the connection.

How to get the path of a running JAR file?

You can also use:

CodeSource codeSource = YourMainClass.class.getProtectionDomain().getCodeSource();
File jarFile = new File(codeSource.getLocation().toURI().getPath());
String jarDir = jarFile.getParentFile().getPath();

Create folder with batch but only if it doesn't already exist

Just call mkdir C:\VTS no matter what. It will simply report that the subdirectory already exists.

Edit: As others have noted, this does set the %ERRORLEVEL% if the folder already exists. If your batch (or any processes calling it) doesn't care about the error level, this method works nicely. Since the question made no mention of avoiding the error level, this answer is perfectly valid. It fulfills the needs of creating the folder if it doesn't exist, and it doesn't overwrite the contents of an existing folder. Otherwise follow Martin Schapendonk's answer.

Fixing the order of facets in ggplot

There are a couple of good solutions here.

Similar to the answer from Harpal, but within the facet, so doesn't require any change to underlying data or pre-plotting manipulation:

# Change this code:
facet_grid(.~size) + 
# To this code:
facet_grid(~factor(size, levels=c('50%','100%','150%','200%')))

This is flexible, and can be implemented for any variable as you change what element is faceted, no underlying change in the data required.

Find integer index of rows with NaN in pandas dataframe

And just in case, if you want to find the coordinates of 'nan' for all the columns instead (supposing they are all numericals), here you go:

df = pd.DataFrame([[0,1,3,4,np.nan,2],[3,5,6,np.nan,3,3]])

df
   0  1  2    3    4  5
0  0  1  3  4.0  NaN  2
1  3  5  6  NaN  3.0  3

np.where(np.asanyarray(np.isnan(df)))
(array([0, 1]), array([4, 3]))

Detach (move) subdirectory into separate Git repository

Check out git_split project at https://github.com/vangorra/git_split

Turn git directories into their very own repositories in their own location. No subtree funny business. This script will take an existing directory in your git repository and turn that directory into an independent repository of its own. Along the way, it will copy over the entire change history for the directory you provided.

./git_split.sh <src_repo> <src_branch> <relative_dir_path> <dest_repo>
        src_repo  - The source repo to pull from.
        src_branch - The branch of the source repo to pull from. (usually master)
        relative_dir_path   - Relative path of the directory in the source repo to split.
        dest_repo - The repo to push to.

What are the true benefits of ExpandoObject?

After valueTuples, what's the use of ExpandoObject class? this 6 lines code with ExpandoObject:

dynamic T = new ExpandoObject();
T.x = 1;
T.y = 2;
T.z = new ExpandoObject();
T.z.a = 3;
T.b= 4;

can be written in one line with tuples:

var T = (x: 1, y: 2, z: (a: 3, b: 4));

besides with tuple syntax you have strong type inference and intlisense support

Why doesn't margin:auto center an image?

Because your image is an inline-block element. You could change it to a block-level element like this:

<img src="queuedError.jpg" style="margin:auto; width:200px;display:block" />

and it will be centered.

Python BeautifulSoup extract text between element

with your own soup object:

soup.p.next_sibling.strip()

you grab the <p> directly with soup.p *(this hinges on it being the first <p> in the parse tree)
then use next_sibling on the tag object that soup.p returns since the desired text is nested at the same level of the parse tree as the <p>
.strip() is just a Python str method to remove leading and trailing whitespace

*otherwise just find the element using your choice of filter(s)

in the interpreter this looks something like:

In [4]: soup.p
Out[4]: <p>something</p>

In [5]: type(soup.p)
Out[5]: bs4.element.Tag

In [6]: soup.p.next_sibling
Out[6]: u'\n      THIS IS MY TEXT\n      '

In [7]: type(soup.p.next_sibling)
Out[7]: bs4.element.NavigableString

In [8]: soup.p.next_sibling.strip()
Out[8]: u'THIS IS MY TEXT'

In [9]: type(soup.p.next_sibling.strip())
Out[9]: unicode

Specifying content of an iframe instead of the src attribute to a page

You can use data: URL in the src:

_x000D_

var html = 'Hello from <img src="http://stackoverflow.com/favicon.ico" alt="SO">';_x000D_
var iframe = document.querySelector('iframe');_x000D_
iframe.src = 'data:text/html,' + encodeURIComponent(html);

_x000D_

<iframe></iframe>

_x000D_

Difference between srcdoc=“…” and src=“data:text/html,…” in an iframe.

Convert HTML to data:text/html link using JavaScript.

MySQL Calculate Percentage

try this

   SELECT group_name, employees, surveys, COUNT( surveys ) AS test1, 
        concat(round(( surveys/employees * 100 ),2),'%') AS percentage
    FROM a_test
    GROUP BY employees

DEMO HERE

Jackson - best way writes a java list to a json array

In objectMapper we have writeValueAsString() which accepts object as parameter. We can pass object list as parameter get the string back.

List<Apartment> aptList =  new ArrayList<Apartment>();
    Apartment aptmt = null;
    for(int i=0;i<5;i++){
         aptmt= new Apartment();
         aptmt.setAptName("Apartment Name : ArrowHead Ranch");
         aptmt.setAptNum("3153"+i);
         aptmt.setPhase((i+1));
         aptmt.setFloorLevel(i+2);
         aptList.add(aptmt);
    }
mapper.writeValueAsString(aptList)

Convert MySql DateTime stamp into JavaScript's Date format

var a=dateString.split(" ");
var b=a[0].split("-");
var c=a[1].split(":");
var date = new Date(b[0],(b[1]-1),b[2],b[0],c[1],c[2]);

How to check if running in Cygwin, Mac or Linux?

Ok, here is my way.

osis()
{
    local n=0
    if [[ "$1" = "-n" ]]; then n=1;shift; fi

    # echo $OS|grep $1 -i >/dev/null
    uname -s |grep -i "$1" >/dev/null

    return $(( $n ^ $? ))
}

e.g.

osis Darwin &&
{
    log_debug Detect mac osx
}
osis Linux &&
{
    log_debug Detect linux
}
osis -n Cygwin &&
{
    log_debug Not Cygwin
}

I use this in my dotfiles

Access files stored on Amazon S3 through web browser

Filestash is the perfect tool for that:

create a shared link:

Share it with the world

Also Filestash is open source. (Disclaimer: I am the author)

What method in the String class returns only the first N characters?

substring(int startpos, int lenght);

PHP, display image with Header()

The best solution would be to read in the file, then decide which kind of image it is and send out the appropriate header

$filename = basename($file);
$file_extension = strtolower(substr(strrchr($filename,"."),1));

switch( $file_extension ) {
    case "gif": $ctype="image/gif"; break;
    case "png": $ctype="image/png"; break;
    case "jpeg":
    case "jpg": $ctype="image/jpeg"; break;
    case "svg": $ctype="image/svg+xml"; break;
    default:
}

header('Content-type: ' . $ctype);

(Note: the correct content-type for JPG files is image/jpeg)

MongoDB: How to update multiple documents with a single command?

The following command can update multiple records of a collection

db.collection.update({}, 
{$set:{"field" : "value"}}, 
{ multi: true, upsert: false}
)

How to import an Oracle database from dmp file and log file?

If you are using impdp command example from @sathyajith-bhat response:

impdp <username>/<password> directory=<directoryname> dumpfile=<filename>.dmp logfile=<filename>.log full=y;

you will need to use mandatory parameter directory and create and grant it as:

CREATE OR REPLACE DIRECTORY DMP_DIR AS 'c:\Users\USER\Downloads';
GRANT READ, WRITE ON DIRECTORY DMP_DIR TO {USER};

or use one of defined:

select * from DBA_DIRECTORIES;

My ORACLE Express 11g R2 has default named DATA_PUMP_DIR (located at {inst_dir}\app\oracle/admin/xe/dpdump/) you sill need to grant it for your user.

How to create a JPA query with LEFT OUTER JOIN

Write this;

 SELECT f from Student f LEFT JOIN f.classTbls s WHERE s.ClassName = 'abc'

Because your Student entity has One To Many relationship with ClassTbl entity.

Assign output to variable in Bash

Same with something more complex...getting the ec2 instance region from within the instance.

INSTANCE_REGION=$(curl -s 'http://169.254.169.254/latest/dynamic/instance-identity/document' | python -c "import sys, json; print json.load(sys.stdin)['region']")

echo $INSTANCE_REGION

how to set ulimit / file descriptor on docker container the image tag is phusion/baseimage-docker

If using the docker-compose file, Based on docker compose version 2.x We can set like as below, by overriding the default config.

ulimits:
  nproc: 65535
  nofile:
    soft: 26677
    hard: 46677

https://docs.docker.com/compose/compose-file/

How to use the TextWatcher class in Android?

For use of the TextWatcher...

et1.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

        // TODO Auto-generated method stub
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        // TODO Auto-generated method stub
    }

    @Override
    public void afterTextChanged(Editable s) {

        // TODO Auto-generated method stub
    }
});

jquery .html() vs .append()

if by .add you mean .append, then the result is the same if #myDiv is empty.

is the performance the same? dont know.

.html(x) ends up doing the same thing as .empty().append(x)

Android Studio: Add jar as library?

I have read all the answers here and they all seem to cover old versions of Android Studio!

With a project created with Android Studio 2.2.3 I just needed to create a libs directory under app and place my jar there. I did that with my file manager, no need to click or edit anything in Android Studio.

Why it works? Open Build / Edit Libraries and Dependencies and you will see:

{include=[*.jar], dir=libs}

How to push object into an array using AngularJS

Please check this - http://plnkr.co/edit/5Sx4k8tbWaO1qsdMEWYI?p=preview

Controller-

var app= angular.module('app', []);

app.controller('TestController', function($scope) {
    this.arrayText = [{text:'Hello',},{text: 'world'}];

    this.addText = function(text) {

      if(text) {
        var obj = {
          text: text
        };
          this.arrayText.push(obj);
          this.myText = '';
          console.log(this.arrayText);
        }
      } 
 });

HTML

<form ng-controller="TestController as testCtrl" ng-submit="testCtrl.addText(testCtrl.myText)">
        <input type="text" ng-model="testCtrl.myText" value="Lets go">
        <button type="submit">Add</button>
        <div ng-repeat="item in testCtrl.arrayText">
            <span>{{item}}</span>
        </div>
</form>

How to get .app file of a xcode application

In Xcode 7 a quick way is to use Product > Archive. It's probably not a signed copy for submission but it's good enough to give to somebody else for testing.

Using sed and grep/egrep to search and replace

Another way to do this

find . -name *.xml -exec sed -i "s/4.6.0-SNAPSHOT/5.0.0-SNAPSHOT/" {} \;

Some help regarding the above command

The find will do the find for you on the current directory indicated by .

-name the name of the file in my case its pom.xml can give wild cards.

-exec execute

sed stream editor

-i ignore case

s is for substitute

/4.6.0.../ String to be searched

/5.0.0.../ String to be replaced

A simple explanation of Naive Bayes Classification

Ram Narasimhan explained the concept very nicely here below is an alternative explanation through the code example of Naive Bayes in action
It uses an example problem from this book on page 351
This is the data set that we will be using

In the above dataset if we give the hypothesis = {"Age":'<=30', "Income":"medium", "Student":'yes' , "Creadit_Rating":'fair'} then what is the probability that he will buy or will not buy a computer.
The code below exactly answers that question.
Just create a file called named new_dataset.csv and paste the following content.

Age,Income,Student,Creadit_Rating,Buys_Computer
<=30,high,no,fair,no
<=30,high,no,excellent,no
31-40,high,no,fair,yes
>40,medium,no,fair,yes
>40,low,yes,fair,yes
>40,low,yes,excellent,no
31-40,low,yes,excellent,yes
<=30,medium,no,fair,no
<=30,low,yes,fair,yes
>40,medium,yes,fair,yes
<=30,medium,yes,excellent,yes
31-40,medium,no,excellent,yes
31-40,high,yes,fair,yes
>40,medium,no,excellent,no

Here is the code the comments explains everything we are doing here! [python]

import pandas as pd 
import pprint 

class Classifier():
    data = None
    class_attr = None
    priori = {}
    cp = {}
    hypothesis = None


    def __init__(self,filename=None, class_attr=None ):
        self.data = pd.read_csv(filename, sep=',', header =(0))
        self.class_attr = class_attr

    '''
        probability(class) =    How many  times it appears in cloumn
                             __________________________________________
                                  count of all class attribute
    '''
    def calculate_priori(self):
        class_values = list(set(self.data[self.class_attr]))
        class_data =  list(self.data[self.class_attr])
        for i in class_values:
            self.priori[i]  = class_data.count(i)/float(len(class_data))
        print "Priori Values: ", self.priori

    '''
        Here we calculate the individual probabilites 
        P(outcome|evidence) =   P(Likelihood of Evidence) x Prior prob of outcome
                               ___________________________________________
                                                    P(Evidence)
    '''
    def get_cp(self, attr, attr_type, class_value):
        data_attr = list(self.data[attr])
        class_data = list(self.data[self.class_attr])
        total =1
        for i in range(0, len(data_attr)):
            if class_data[i] == class_value and data_attr[i] == attr_type:
                total+=1
        return total/float(class_data.count(class_value))

    '''
        Here we calculate Likelihood of Evidence and multiple all individual probabilities with priori
        (Outcome|Multiple Evidence) = P(Evidence1|Outcome) x P(Evidence2|outcome) x ... x P(EvidenceN|outcome) x P(Outcome)
        scaled by P(Multiple Evidence)
    '''
    def calculate_conditional_probabilities(self, hypothesis):
        for i in self.priori:
            self.cp[i] = {}
            for j in hypothesis:
                self.cp[i].update({ hypothesis[j]: self.get_cp(j, hypothesis[j], i)})
        print "\nCalculated Conditional Probabilities: \n"
        pprint.pprint(self.cp)

    def classify(self):
        print "Result: "
        for i in self.cp:
            print i, " ==> ", reduce(lambda x, y: x*y, self.cp[i].values())*self.priori[i]

if __name__ == "__main__":
    c = Classifier(filename="new_dataset.csv", class_attr="Buys_Computer" )
    c.calculate_priori()
    c.hypothesis = {"Age":'<=30', "Income":"medium", "Student":'yes' , "Creadit_Rating":'fair'}

    c.calculate_conditional_probabilities(c.hypothesis)
    c.classify()

output:

Priori Values:  {'yes': 0.6428571428571429, 'no': 0.35714285714285715}

Calculated Conditional Probabilities: 

{
 'no': {
        '<=30': 0.8,
        'fair': 0.6, 
        'medium': 0.6, 
        'yes': 0.4
        },
'yes': {
        '<=30': 0.3333333333333333,
        'fair': 0.7777777777777778,
        'medium': 0.5555555555555556,
        'yes': 0.7777777777777778
      }
}

Result: 
yes  ==>  0.0720164609053
no  ==>  0.0411428571429

Hope it helps in better understanding the problem

peace

Returning binary file from controller in ASP.NET Web API

The overload that you're using sets the enumeration of serialization formatters. You need to specify the content type explicitly like:

httpResponseMessage.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");

How to do if-else in Thymeleaf?

Another solution is just using not to get the opposite negation:

<h2 th:if="${potentially_complex_expression}">Hello!</h2>
<span class="xxx" th:if="${not potentially_complex_expression}">Something else</span>

As explained in the documentation, it's the same thing as using th:unless. As other answers have explained:

Also, th:if has an inverse attribute, th:unless, which we could have used in the previous example instead of using a not inside the OGNL expression

Using not also works, but IMHO it is more readable to use th:unless instead of negating the condition with not.

C# How to determine if a number is a multiple of another?

Use the modulus (%) operator:

6 % 3 == 0
7 % 3 == 1

Java - How to find the redirected url of a url?

public static URL getFinalURL(URL url) {
    try {
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setInstanceFollowRedirects(false);
        con.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36");
        con.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
        con.addRequestProperty("Referer", "https://www.google.com/");
        con.connect();
        //con.getInputStream();
        int resCode = con.getResponseCode();
        if (resCode == HttpURLConnection.HTTP_SEE_OTHER
                || resCode == HttpURLConnection.HTTP_MOVED_PERM
                || resCode == HttpURLConnection.HTTP_MOVED_TEMP) {
            String Location = con.getHeaderField("Location");
            if (Location.startsWith("/")) {
                Location = url.getProtocol() + "://" + url.getHost() + Location;
            }
            return getFinalURL(new URL(Location));
        }
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }
    return url;
}

To get "User-Agent" and "Referer" by yourself, just go to developer mode of one of your installed browser (E.g. press F12 on Google Chrome). Then go to tab 'Network' and then click on one of the requests. You should see it's details. Just press 'Headers' sub tab (the image below)

Getting msbuild.exe without installing Visual Studio

It used to be installed with the .NET framework. MsBuild v12.0 (2013) is now bundled as a stand-alone utility and has it's own installer.

http://www.microsoft.com/en-us/download/confirmation.aspx?id=40760

To reference the location of MsBuild.exe from within an MsBuild script, use the default $(MsBuildToolsPath) property.

How to increase time in web.config for executing sql query

SQL Server has no setting to control query timeout in the connection string, and as far as I know this is the same for other major databases. But, this doesn't look like the problem you're seeing: I'd expect to see an exception raised

Error: System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

if there genuinely was a timeout executing the query.

If this does turn out to be a problem, you can change the default timeout for a SQL Server database as a property of the database itself; use SQL Server Manager for this.

Be sure that the query is exactly the same from your Web application as the one you're running directly. Use a profiler to verify this.

What exactly is Python's file.flush() doing?

It flushes the internal buffer, which is supposed to cause the OS to write out the buffer to the file.[1] Python uses the OS's default buffering unless you configure it do otherwise.

But sometimes the OS still chooses not to cooperate. Especially with wonderful things like write-delays in Windows/NTFS. Basically the internal buffer is flushed, but the OS buffer is still holding on to it. So you have to tell the OS to write it to disk with os.fsync() in those cases.

[1] http://docs.python.org/library/stdtypes.html

What are the most-used vim commands/keypresses?

Here's a tip sheet I wrote up once, with the commands I actually use regularly:

References

General

Nearly all commands can be preceded by a number for a repeat count. eg. 5dd delete 5 lines
<Esc> gets you out of any mode and back to command mode
Commands preceded by : are executed on the command line at the bottom of the screen
:help help with any command

Navigation

Cursor movement: ?h ?j ?k l?
By words:
- w next word (by punctuation); W next word (by spaces)
- b back word (by punctuation); B back word (by spaces)
- e end word (by punctuation); E end word (by spaces)
By line:
- 0 start of line; ^ first non-whitespace
- $ end of line
By paragraph:
- { previous blank line; } next blank line
By file:
- gg start of file; G end of file
- 123G go to specific line number
By marker:
- mx set mark x; 'x go to mark x
- '. go to position of last edit
- ' ' go back to last point before jump
Scrolling:
- ^F forward full screen; ^B backward full screen
- ^D down half screen; ^U up half screen
- ^E scroll one line up; ^Y scroll one line down
- zz centre cursor line

Editing

u undo; ^R redo
. repeat last editing command

Inserting

All insertion commands are terminated with <Esc> to return to command mode.

i insert text at cursor; I insert text at start of line
a append text after cursor; A append text after end of line
o open new line below; O open new line above

Changing

r replace single character; R replace multiple characters
s change single character
cw change word; C change to end of line; cc change whole line
c<motion> changes text in the direction of the motion
ci( change inside parentheses (see text object selection for more examples)

Deleting

x delete char
dw delete word; D delete to end of line; dd delete whole line
d<motion> deletes in the direction of the motion

Cut and paste

yy copy line into paste buffer; dd cut line into paste buffer
p paste buffer below cursor line; P paste buffer above cursor line
xp swap two characters (x to delete one character, then p to put it back after the cursor position)

Blocks

v visual block stream; V visual block line; ^V visual block column
- most motion commands extend the block to the new cursor position
- o moves the cursor to the other end of the block
d or x cut block into paste buffer
y copy block into paste buffer
> indent block; < unindent block
gv reselect last visual block

Global

:%s/foo/bar/g substitute all occurrences of "foo" to "bar"
- % is a range that indicates every line in the file
- /g is a flag that changes all occurrences on a line instead of just the first one

Searching

/ search forward; ? search backward
* search forward for word under cursor; # search backward for word under cursor
n next match in same direction; N next match in opposite direction
fx forward to next character x; Fx backward to previous character x
; move again to same character in same direction; , move again to same character in opposite direction

Files

:w write file to disk
:w name write file to disk as name
ZZ write file to disk and quit
:n edit a new file; :n! edit a new file without saving current changes
:q quit editing a file; :q! quit editing without saving changes
:e edit same file again (if changed outside vim)
:e . directory explorer

Windows

^Wn new window
^Wj down to next window; ^Wk up to previous window
^W_ maximise current window; ^W= make all windows equal size
^W+ increase window size; ^W- decrease window size

Source Navigation

% jump to matching parenthesis/bracket/brace, or language block if language module loaded
gd go to definition of local symbol under cursor; ^O return to previous position
^] jump to definition of global symbol (requires tags file); ^T return to previous position (arbitrary stack of positions maintained)
^N (in insert mode) automatic word completion

Show local changes

Vim has some features that make it easy to highlight lines that have been changed from a base version in source control. I have created a small vim script that makes this easy: http://github.com/ghewgill/vim-scmdiff

TypeScript: Property does not exist on type '{}'

When you write the following line of code in TypeScript:

var SUCSS = {};

The type of SUCSS is inferred from the assignment (i.e. it is an empty object type).

You then go on to add a property to this type a few lines later:

SUCSS.fadeDiv = //...

And the compiler warns you that there is no property named fadeDiv on the SUCSS object (this kind of warning often helps you to catch a typo).

You can either... fix it by specifying the type of SUCSS (although this will prevent you from assigning {}, which doesn't satisfy the type you want):

var SUCSS : {fadeDiv: () => void;};

Or by assigning the full value in the first place and let TypeScript infer the types:

var SUCSS = {
    fadeDiv: function () {
        // Simplified version
        alert('Called my func');
    }
};

Select an Option from the Right-Click Menu in Selenium Webdriver - Java

Right click can be achieved using Java script executor as well(in cases where action class is not supported):

JavascriptExecutor js = (JavascriptExecutor) driver;

String javaScript = "var evt = document.createEvent('MouseEvents');"
                + "var RIGHT_CLICK_BUTTON_CODE = 2;"
                + "evt.initMouseEvent('contextmenu', true, true, window, 1, 0, 0, 0, 0, false, false, false, false, RIGHT_CLICK_BUTTON_CODE, null);"
                + "arguments[0].dispatchEvent(evt)";

js.executeScript(javaScript, element);

How do I change the ID of a HTML element with JavaScript?

That seems to work for me:

<html>
<head><style>
#monkey {color:blue}
#ape {color:purple}
</style></head>
<body>
<span id="monkey" onclick="changeid()">
fruit
</span>
<script>
function changeid ()
{
var e = document.getElementById("monkey");
e.id = "ape";
}
</script>
</body>
</html>

The expected behaviour is to change the colour of the word "fruit".

Perhaps your document was not fully loaded when you called the routine?

Hadoop cluster setup - java.net.ConnectException: Connection refused

get in $SPARK_HOME/conf, then open file spark-env.sh and add:

SPARK_MASTER_HOST= your-IP

SPARK_LOCAL_IP=127.0.0.1

Getting Django admin url for an object

If you are using 1.0, try making a custom templatetag that looks like this:

def adminpageurl(object, link=None):
    if link is None:
        link = object
    return "<a href=\"/admin/%s/%s/%d\">%s</a>" % (
        instance._meta.app_label,
        instance._meta.module_name,
        instance.id,
        link,
    )

then just use {% adminpageurl my_object %} in your template (don't forget to load the templatetag first)

Mobile Redirect using htaccess

Similarly, if you wanted to redirect to a sub-folder instead of a sub-domain, do the following:

Working off of Kevin's great solution you can add this to the .htaccess file in your site's root directory:

    <IfModule mod_rewrite.c>
        RewriteBase /
        RewriteEngine On

        # Check if mobile=1 is set and set cookie 'mobile' equal to 1
        RewriteCond %{QUERY_STRING} (^|&)mobile=1(&|$)
        RewriteRule ^ - [CO=mobile:1:%{HTTP_HOST}]

        # Check if mobile=0 is set and set cookie 'mobile' equal to 0
        RewriteCond %{QUERY_STRING} (^|&)mobile=0(&|$)
        RewriteRule ^ - [CO=mobile:0:%{HTTP_HOST}]

        # cookie can't be set and read in the same request so check
        RewriteCond %{QUERY_STRING} (^|&)mobile=0(&|$)
        RewriteRule ^ - [S=1]

        # Check if this looks like a mobile device
        RewriteCond %{HTTP:x-wap-profile} !^$ [OR]
        RewriteCond %{HTTP_USER_AGENT} "android|blackberry|ipad|iphone|ipod|iemobile|opera mobile|palmos|webos|googlebot-mobile" [NC,OR]
        RewriteCond %{HTTP:Profile}       !^$

        # Check if we're not already on the mobile site
        RewriteCond %{HTTP_HOST}          !^m\.
        # Check to make sure we haven't set the cookie before
        RewriteCond %{HTTP:Cookie}        !\mobile=0(;|$)
        # Now redirect to the mobile site
        RewriteRule ^ http://www.mysite.com/m/ [R]
    </IfModule>

Then, in the /m/ folder, add or create an .htaccess with the following:

    #Begin user agent loop fix

         RewriteEngine Off
         RewriteBase /

    #End user agent loop fix

I know it's not a direct answer to the question, but somebody (like me) might stumble upon this question and wonder how that method would be accomplished as well.

using awk with column value conditions

Depending on the AWK implementation are you using == is ok or not.

Have you tried ~?. For example, if you want $1 to be "hello":

awk '$1 ~ /^hello$/{ print $3; }' <infile>

^ means $1 start, and $ is $1 end.

OCI runtime exec failed: exec failed: (...) executable file not found in $PATH": unknown

I was running into this issue and it turned out that I needed to do this:

docker run ${image_name} bash -c "${command}"

Hope that helps someone who finds this error.

Simulating Slow Internet Connection

You can use NetEm (Network Emulation) as a proxy server to emulate many network characteristics (speed, delay, packet loss, etc.). It controls the networking using iproute2 package and it's enabled in the kernel of the most Linux distributions.

It is controlled by the tc command-line application (from the iproute2 package), but there are also some web interface GUIs for NetEm, for example PHPnetemGUI2.

The advantage is that, as I wrote, it can emulate not only different network speeds but also, for example, the packet loss, duplication and/or corruption, random or defined delay, etc., so you can emulate various poorly performing networks.

For your application it's absolutely transparent, you can configure the operating system to use the NetEm proxy server, so all connections from that machine will go trough NetEm. Or you can configure only your application to use it as a proxy.

I have been using it to test the performance of an Android app on various emulated poor-performance networks.

How to build a 'release' APK in Android Studio?

Follow this steps:

-Build
-Generate Signed Apk
-Create new

Then fill up "New Key Store" form. If you wand to change .jnk file destination then chick on destination and give a name to get Ok button. After finishing it you will get "Key store password", "Key alias", "Key password" Press next and change your the destination folder. Then press finish, thats all. :)

enter image description here

Ajax request returns 200 OK, but an error event is fired instead of success

See this. Its also similar problem. Working i tried.

Dont remove dataType: 'JSON',

Note: echo only JSON Formate in PHP file if you use only php echo your ajax code return 200

Bootstrap 4: responsive sidebar menu to top navbar

It could be done in Bootstrap 4 using the responsive grid columns. One column for the sidebar and one for the main content.

Bootstrap 4 Sidebar switch to Top Navbar on mobile

<div class="container-fluid h-100">
    <div class="row h-100">
        <aside class="col-12 col-md-2 p-0 bg-dark">
            <nav class="navbar navbar-expand navbar-dark bg-dark flex-md-column flex-row align-items-start">
                <div class="collapse navbar-collapse">
                    <ul class="flex-md-column flex-row navbar-nav w-100 justify-content-between">
                        <li class="nav-item">
                            <a class="nav-link pl-0" href="#">Link</a>
                        </li>
                        ..
                    </ul>
                </div>
            </nav>
        </aside>
        <main class="col">
            ..
        </main>
    </div>
</div>

Alternate sidebar to top
Fixed sidebar to top

For the reverse (Top Navbar that becomes a Sidebar), can be done like this example

How to fix error "ERROR: Command errored out with exit status 1: python." when trying to install django-heroku using pip

You need to add the package containing the executable pg_config.

A prior answer should have details you need: pg_config executable not found

Can git undo a checkout of unstaged files

If you are using a "professional" IDE chances are good that you can restore files from a local History. In Rubymine for example you can right click files and watch a history of changes independent from the git changes, saved me a few times now ^^

How to perform Join between multiple tables in LINQ lambda

What you've seen is what you get - and it's exactly what you asked for, here:

(ppc, c) => new { productproductcategory = ppc, category = c}

That's a lambda expression returning an anonymous type with those two properties.

In your CategorizedProducts, you just need to go via those properties:

CategorizedProducts catProducts = query.Select(
      m => new { 
             ProdId = m.productproductcategory.product.Id, 
             CatId = m.category.CatId, 
             // other assignments 
           });

Strict Standards: Only variables should be assigned by reference PHP 5.4

You should remove the & (ampersand) symbol, so that line 4 will look like this:

$conn = ADONewConnection($config['db_type']);

This is because ADONewConnection already returns an object by reference. As per documentation, assigning the result of a reference to object by reference results in an E_DEPRECATED message as of PHP 5.3.0

How can I change a button's color on hover?

a.button a:hover means "a link that's being hovered over that is a child of a link with the class button".

Go instead for a.button:hover.

How do you print in Sublime Text 2

Still no print no native print function, but outside the installing the suggested package, you can go the autohotkey way, as the that app can actually help you run macros for other stuff as well. So you can do something like create a macro that with one click does:

Select all the text
Copies all the text
Opens your other edit of choice
pastes text
Prints text

No the most glamorous of options but could also work if the receiving app has can accept code-formatting.

CSS - Syntax to select a class within an id

Just needed to drill down to the last li.

    #navigation li .navigationLevel2 li

Something better than .NET Reflector?

I am not sure what you really want here. If you want to see the .NET framework source code, you may try Netmassdownloader. It's free.

If you want to see any assembly's code (not just .NET), you can use ReSharper. Although it's not free.

Injecting @Autowired private field during testing

You can absolutely inject mocks on MyLauncher in your test. I am sure if you show what mocking framework you are using someone would be quick to provide an answer. With mockito I would look into using @RunWith(MockitoJUnitRunner.class) and using annotations for myLauncher. It would look something like what is below.

@RunWith(MockitoJUnitRunner.class)
public class MyLauncherTest
    @InjectMocks
    private MyLauncher myLauncher = new MyLauncher();

    @Mock
    private MyService myService;

    @Test
    public void someTest() {

    }
}

Difference between abstraction and encapsulation?

Abstraction and Encapsulation both are know for data hiding. But there is big difference.

Encapsulation

Encapsulation is a process of binding or wrapping the data and the codes that operates on the data into a single unit called Class.

Encapsulation solves the problem at implementation level.

In class, you can hide data by using private or protected access modifiers.

Abstraction

Abstraction is the concept of hiding irrelevant details. In other words make complex system simple by hiding the unnecessary detail from the user.

Abstraction solves the problem at design level.

You can achieve abstraction by creating interface and abstract class in Java.

In ruby you can achieve abstraction by creating modules.

Ex: We use (collect, map, reduce, sort...) methods of Enumerable module with Array and Hash in ruby.

Changing precision of numeric column in Oracle

If the table is compressed this will work:

alter table EVAPP_FEES add AMOUNT_TEMP NUMBER(14,2);

update EVAPP_FEES set AMOUNT_TEMP = AMOUNT;

update EVAPP_FEES set AMOUNT = null;

alter table EVAPP_FEES modify AMOUNT NUMBER(14,2);

update EVAPP_FEES set AMOUNT = AMOUNT_TEMP;

alter table EVAPP_FEES move nocompress;

alter table EVAPP_FEES drop column AMOUNT_TEMP;

alter table EVAPP_FEES compress;

JsonParseException: Unrecognized token 'http': was expecting ('true', 'false' or 'null')

It might be obvious, but make sure that you are sending to the parser URL object not a String containing www adress. This will not work:

    ObjectMapper mapper = new ObjectMapper();
    String www = "www.sample.pl";
    Weather weather = mapper.readValue(www, Weather.class);

But this will:

    ObjectMapper mapper = new ObjectMapper();
    URL www = new URL("http://www.oracle.com/");
    Weather weather = mapper.readValue(www, Weather.class);

How do you count the elements of an array in java

When defining an array, you are setting aside a block of memory to hold all the items you want to have in the array.

This will have a default value, depending on the type of the array member types.

What you can't do is find out the number of items that you have populated, except for tracking it in your own code.

In Perl, how can I read an entire file into a string?

All the posts are slightly non-idiomatic. The idiom is:

open my $fh, '<', $filename or die "error opening $filename: $!";
my $data = do { local $/; <$fh> };

Mostly, there is no need to set $/ to undef.

How to set width and height dynamically using jQuery

As @Misha Moroshko has already posted himself, this works:

$("#mainTable").css("width", 100);
$("#mainTable").css("height", 200);

There's some advantage to this technique over @Nick Craver's accepted answer - you can also specifiy different units:

$("#mainTable").css("width", "100%");

So @Nick Craver's method might actually be the wrong choice for some users. From the jquery API (http://api.jquery.com/width/):

The difference between .css(width) and .width() is that the latter returns a unit-less pixel value (for example, 400) while the former returns a value with units intact (for example, 400px). The .width() method is recommended when an element's width needs to be used in a mathematical calculation.

What is the best way to prevent session hijacking?

Encrypting the session value will have zero effect. The session cookie is already an arbitrary value, encrypting it will just generate another arbitrary value that can be sniffed.

The only real solution is HTTPS. If you don't want to do SSL on your whole site (maybe you have performance concerns), you might be able to get away with only SSL protecting the sensitive areas. To do that, first make sure your login page is HTTPS. When a user logs in, set a secure cookie (meaning the browser will only transmit it over an SSL link) in addition to the regular session cookie. Then, when a user visits one of your "sensitive" areas, redirect them to HTTPS, and check for the presence of that secure cookie. A real user will have it, a session hijacker will not.

EDIT: This answer was originally written in 2008. It's 2016 now, and there's no reason not to have SSL across your entire site. No more plaintext HTTP!

How to change the application launcher icon on Flutter?

You have to replace the Flutter icon files with images of your own. This site will help you turn your png into launcher icons of various sizes:

https://romannurik.github.io/AndroidAssetStudio/icons-launcher.html

How can I specify a branch/tag when adding a Git submodule?

I have this in my .gitconfig file. It is still a draft, but proved useful as of now. It helps me to always reattach the submodules to their branch.

[alias]

######################
#
#Submodules aliases
#
######################


#git sm-trackbranch : places all submodules on their respective branch specified in .gitmodules
#This works if submodules are configured to track a branch, i.e if .gitmodules looks like :
#[submodule "my-submodule"]
#   path = my-submodule
#   url = [email protected]/my-submodule.git
#   branch = my-branch
sm-trackbranch = "! git submodule foreach -q --recursive 'branch=\"$(git config -f $toplevel/.gitmodules submodule.$name.branch)\"; git checkout $branch'"

#sm-pullrebase :
# - pull --rebase on the master repo
# - sm-trackbranch on every submodule
# - pull --rebase on each submodule
#
# Important note :
#- have a clean master repo and subrepos before doing this !
#- this is *not* equivalent to getting the last committed 
#  master repo + its submodules: if some submodules are tracking branches 
#  that have evolved since the last commit in the master repo,
#  they will be using those more recent commits !
#
#  (Note : On the contrary, git submodule update will stick 
#to the last committed SHA1 in the master repo)
#
sm-pullrebase = "! git pull --rebase; git submodule update; git sm-trackbranch ; git submodule foreach 'git pull --rebase' "

# git sm-diff will diff the master repo *and* its submodules
sm-diff = "! git diff && git submodule foreach 'git diff' "

#git sm-push will ask to push also submodules
sm-push = push --recurse-submodules=on-demand

#git alias : list all aliases
#useful in order to learn git syntax
alias = "!git config -l | grep alias | cut -c 7-"

How do I break out of nested loops in Java?

I needed to do a similar thing, but I chose not to use the enhanced for loop to do it.

int s = type.size();
for (int i = 0; i < s; i++) {
    for (int j = 0; j < t.size(); j++) {
        if (condition) {
            // do stuff after which you want 
            // to completely break out of both loops
            s = 0; // enables the _main_ loop to terminate
            break;
        }
    }
}

How to change text and background color?

You can use the function system.

system("color *background**foreground*");

For background and foreground, type in a number from 0 - 9 or a letter from A - F.

For example:

system("color A1");
std::cout<<"hi"<<std::endl;

That would display the letters "hi" with a green background and blue text.

To see all the color choices, just type in:

system("color %");

to see what number or letter represents what color.

Bug? #1146 - Table 'xxx.xxxxx' doesn't exist

Today i was facing same problem. I was in very difficult situation but what id did i create a table with diffrent name e.g (modulemaster was not creating then i create modulemaster1) and after creating table i just do the rename table.

What does LPCWSTR stand for and how should it be handled with?

LPCWSTR is equivalent to wchar_t const *. It's a pointer to a wide character string that won't be modified by the function call.

You can assign to LPCWSTRs by prepending a L to a string literal: LPCWSTR *myStr = L"Hello World";

LPCTSTR and any other T types, take a string type depending on the Unicode settings for your project. If _UNICODE is defined for your project, the use of T types is the same as the wide character forms, otherwise the Ansi forms. The appropriate function will also be called this way: FindWindowEx is defined as FindWindowExA or FindWindowExW depending on this definition.

return results from a function (javascript, nodejs)

You are trying to execute an asynchronous function in a synchronous way, which is unfortunately not possible in Javascript.

As you guessed correctly, the roomId=results.... is executed when the loading from the DB completes, which is done asynchronously, so AFTER the resto of your code is completed.

Look at this article, it talks about .insert and not .find, but the idea is the same : http://metaduck.com/01-asynchronous-iteration-patterns.html

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